Which correctly describes Earth's population over the centuries?
O A. It has risen steadily.
B. It has remained steady overall.
C. It has risen at an increasing rate.
O D. It has declined in some places due to migration.
SUBM
Answers
It has risen at an increasing rate throughout time. This rate hasn’t been steady due to many reasons. See the attached photo for details.
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Earth's population over the centuries has risen at an increasing rate. So, the correct option is C.
How the population of Earth is increasing?This sharp increase in population has been primarily caused by an increase in the proportion of individuals reaching breeding age, the gradual extension of human life expectancy, growing urbanization, and quickening migration. This expansion has been accompanied by significant changes in the fertility rate.
One of the key reasons for India's population expansion is a drop in death rates brought on by better medical services and a steady birth rate. The widespread illiteracy in India makes people believe that "children are god's blessings," which makes them opposed to the idea of "family planning." Earth's population over the centuries has risen at an increasing rate.
Therefore, the correct option is C.
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Related Questions
Which of the following statements is MOST accurate?
a. Most people who engage in gambling activities become addicted to it
and end up taking bankruptcy because they cannot pay their bills.
b. People at lower income levels lower use a larger percentage of their
income to buy lottery and scratch tickets than people at higher levels of
income.
c. Gambling is a moral issue, with little or no economic or financial impact
on individuals or society.
d. Casinos only have a positive impact on communities because they create
jobs and generate wealth.
Answers
Answer:
C
Explanation:
Question 7 of 10
A cell membrane is very specific about what it allows across. How does this
help the cell?
O A. Transport proteins allow only enzymes to pass through the
membrane.
O B. It is better for the cell if most molecules are prevented from
entering.
O C. The cell works better when it contains fewer proteins.
D. It helps the cell absorb as many different molecules as possible.
Answers
Answer:
The answer is D
Explanation:
As the cell is mostly dependant on ingested materials so this will help the cell to grow and perform other important activities in the cell
What is a photosynthetic pigment
A. A man-made compound that reacts to light
B. An oxygen based compound that captures light energy.
C. A light sensitive compound that changes color.
D. A colored compound that captures light energy.
Answers
Answer:
Answer D is correct.
Explanation:
A colored compound that captures light energy.
This photosynthetic pigment means the pigment which is present in chloroplasts to absorb or capture the light energy to do photosynthesis.
Hope this helps you
. Q.. List any two advantages associated with water stored in the ground.
Answers
Answer:
It does not evaporate.
It recharges wells near the area.
It provides moisture to the vegetation.
It does not provide breeding grounds for mosquitos , like stagnant water in lakes and ponds.
It is relatively protected from contamination by animal and human waste.
Explanation:
Can someone please help me!
Answers
Answer:
thats the 2 number point okay,plasma contains platelets ,ok
A tube with a membrane covering the bottom is placed in a beaker. The membrane allows water to flow through but not salt or glucose. The tube contains an aqueous solution with 4% salt and 20% glucose and the beaker contains an aqueous solution with 12% salt and 6% glucose. How could you describe the solution in the beaker compared to the solution in the tube
Answers
Answer:
The solution in the tube is hypertonic to the solution in the beaker.
Explanation:
To compare the solutions, find the total amount of solutes in both the tube and beaker.
The tube has 4% salt and 20% glucose, so it has 24% solute.
The beaker has 12% salt and 6% glucose, so it has 18% solute.
Since 24 is larger than 18, this means the tube has more solute.
Since the tube has more solute and less water compared to the beaker, it is hypertonic to the beaker.
So, the answer is that the solution in the tube is hypertonic to the solution in the beaker.
Solutions are hypertonic or hypotonic to other solutions according to their solute concentration grade. In the exposed example, the beaker aqueous solution is hypotonic to the tube solution, meaning it is less concentrated.
--------------------
Available data:
The membrane allows water to flow through but not salt or glucoseThe tube contains an aqueous solution with 4% salt and 20% glucoseThe beaker contains an aqueous solution with 12% salt and 6% glucoseWe need to describe and compare solutions.
To do it, first, we will review some theoretical framework.
When talking about solutions in compartison with the cell content, we can classify them as follows,
• HYPERTONIC ⇒ A hypertonic solution has a higher concentration of solute than the cell. This means that in the cell interior, the solute concentration is lower than in the solution itself.
• ISOTONIC ⇒ The solute concentration is the same inside the cell and outside.
• HYPOTONIC ⇒ A hypotonic solution has a lower concentration of solute than the cell. This means that in the cell interior, the solute concentration is higher than in the solution itself.
When a cell is in a hypotonic solution, through osmosis, water moves toward the cell.
Osmosis is the phenomenon that occurs when two dilutions of different concentrations -in this example, the interior of the tube and the beaker- are separated by a semipermeable membrane.
The membrane allows the pass of water but not solute. Hence, water can move from the most diluted side to the less diluted one.
What we need to consider is
• When a cell with semipermeable membrane is placed in a hypotonic solution, water enters the cell.
• When a cell with semipermeable membrane is placed in an isotonic solution, there is no water movement.
• When a cell with semipermeable membrane is placed in a hypertonic solution, water gets out of the cell.
In simple words, in the proposed experiment, glucose and salt -solutes- can not cross the membrane, but water can. The tube represents a cell. So,
The tube has 4% salt and the beaker 12 % saltThe tube has 20% glucose and the beaker 6% glucose.To make the analysis easier, we can add the concentration percentages of glucose and salt at each side of the membrane, and then compare them.
The tube contains an aqueous solution with 24% solute (4% salt + 20% glucose)The beacker contains an aqueous solution with 18% solute (12% salt + 6% glucose)We can see that the concentration of solute is higher in the interior of the tube than in the beaker. This difference suggests that water will move forward to the tube interior.
According to this analysis, we can say that
The tube aqueous solution is hypertonic to the beaker solution → More concentratedThe beaker aqueous solution is hypotonic to the tube solution → Less concentrated---------------------------------------------
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Explain how homologous and the fossil records support evolution.
Thanks so much!!!
Answers
Answer:
Los fósiles, una prueba de la evolucion. El estudio de los fósiles nos da una idea muy directa de los cambios que sufrieron las especies al transformarse unas en otras; existen muchas series de fósiles de plantas y animales que nos permiten reconstruir cómo se fueron adaptando a las cambiantes
Explanation:
Answer:
homologous: have identical position, value, or structure
Fossils: In the oldest rocks area unit fossils of the best organisms and within the newest rocks area unit fossils of additional advanced organisms.
Explanation:
The evolution theory is supported by multiple sorts of evidence: homologous structures show common ancestry, whereas similar selective pressure will manufacture similar variations. analogous structures (beneficial features).
In the oldest rocks area unit fossils of the best organisms and within the newest rocks area unit fossils of additional advanced organisms. This supports Darwin's organic process theory, whereby straightforward life forms {progressively|increasingly|more and additional} evolved into more advanced. Proof of adolescence forms comes from fossils.
if the velocity of a vehicle starting from rest reaches 5m/2s in 2seconds, is the velocity of the vehicle uniform ?explain.
Answers
Explanation:
Avg speed × total times = total distance
20×25=500
Since acceleration in the 1st interval is same as deceleration in the 3rd interval and deceleration is from the same velocity achieved after acceleration, t
1
=t
3
s
1
=
2
1
×5t
1
2
s
2
=(5t
1
)t
2
s
3
=(5t
1
)×t
3
−
2
1
×5×t
1
2
=(5t
1
)×t
1
−
2
1
×5×t
1
2
s
1
+s
2
+s
3
=5t
1
t
2
+5t
1
2
⇒5t
1
2
+5t
1
t
2
=500−−−−1
2t
1
+t
2
=25−−−−2
Solving (1 ) and (2) ⇒t
1
=5,t
2
=15sec
These penguins are all members of the species Aptenodytes patagonicus.
Answers
Answer:
Organisms of the same species can live in different areas, while organisms of the same population live in only one area.
Explanation:
Answer:
Option D
Explanation:
Populations are all in one area
If your body lacks enzymes that break down carbohydrates, it would be unable to get __A__ for energy production. If you lacked the enzyme to digest proteins, you may not absorb enough __B__.
Answers
Answer:
Glucose and amino acid.
Explanation:
If your body lacks enzymes that break down carbohydrates, it would be unable to get glucose for energy production while on the other hand, if you lacked the enzyme to digest proteins, you may not absorb enough amino acid that our body needs for the formation of muscles. Enzymes play a great role in the breakdown of macro food particles into simpler molecules so that it can be absorbed by the cells.
Answer:
A: Sugar Molecules
B: Amino Acids
Hope this helps!
Explanation:
What sources must health care workers use when deciding which abbreviations and symbols to use on the job?
a. Those listed in their textbooks
b. Those approved by the facility in which they work
c. Those listed in medical dictionaries and reference books,
d. Those provided by their professional organization.
Answers
What is nitrogen fixation?List all the ways in which nitrogen fixation takes place in nature.
Answers
Answer:
Hey mate.....
Explanation:
This is ur answer.....
Some forms of bacteria can convert atmospheric nitrogen into usable forms such as nitrates and nitrites. Such nitrogen fixing bacteria are commonly found in the roots of leguminous plants. These usable forms of nitrogen are absorbed by plants to produce many compounds such as amino acids, which in turn form proteins.
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9.
Which is an environmental factor that affects skin color in humans?
O number of genes inherited
O amount of sunlight absorbed
O number of linked genes
O amount of food consumed
Answers
Which is an environmental factor that affects skin color in humans?
O number of genes inherited
O amount of sunlight absorbed
O number of linked genes
O amount of food consumed
ANSWER:-AMOUNT OF SUNLIGHT ABSORBED.
Number of gene for color of the skin is same in all the human beings and also it's a genetic factors is there will be any absence of gene due to its deletion AMOUNT OF SUNLIGHT it is variable in variable reasons which is a imp factor for the color in variation in earth. In regions near to the equator have high amount of the light so they have darker skin color then the people near the poles as there is less amount of light .Number of gene inherited is also same for each and every individual for single species for human which is 378 gene loci and if there is any variation in number due to any genetics disorder it would be a genetic factor again.amount of food consumed is different for different people with same color in same region as it only depends on the work which is done by the individual in the society for its existence. though it is a environmental factor bit it didn't effect color of the species.SO ACCORDING TO ABOVE DETAILS WE CAN CONCLUDE (2) AMOUNT OF THE SUNLIGHT IS THE ENVIRONMENTAL FACTOR WHICH IS RESPONSIBLE FOR THE COLOR OF THE SKIN IN HUMANS
why is rna a polymer and a macromolecule
Answers
Answer:
RNA is a polymer because it is made up of many monomers called nucleotides. Moreover, RNAs can form macromolecules because many RNAs are large molecules (i.e., polynucleotide chains).
Explanation:
Ribonucleic acid (RNA) can be defined as a single-stranded nucleic acid polymer of the four nucleotides. In RNA, each nucleotide is composed of a 1-ribose sugar, a 2-phosphate group and 3-one of four types of nitrogenous bases: Adenine (A), Cytosine (C), Guanine (G), and Uracil (U), which are covalently bonded to form polynucleotide chains. There are different types of RNAs such as mRNA, tRNA, rRNA, miRNA, circ-RNAs, lncRNAs, etc. Many of these RNAs form large single-stranded (ss) molecules, i.e., polynucleotide chains. For example, an mRNA sequence may have a length of 5,000 nucleotides (5 kb) or even more, and there are RNA viruses that have more than 20000 nucleotides (20 kb) in length.
Which of the following is a way of storing carbon in organic material?
A. Consumption
B. Respiration
C. Burning fossil fuels
D. All of these
Answers
The ways of sorting carbon in organic material is consumption, respiration, and fuel burning. The correct option is D.
What is organic material?Organic matter, also known as organic material or natural organic matter, is a massive source of carbon-based compounds detected in natural and engineered, terrestrial and aquatic environments.
There can be several ways to store carbon including consumption, respiration, and burning fossil fuel, etc.
Carbohydrates, lipids, proteins, and nucleic acids are the four primary types of organic compound present in all living things.
Organic compounds are crucial because carbon is found in all living organisms. They are the essential parts of many of the Earth's cycles.
The carbon cycle, for example, encompasses the exchange of carbon between plants and animals during photosynthesis and cellular respiration.
Thus, the correct option is D.
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Iron-55 has a half-life of 3 years. How much of a 40 gram sample will remain after 12 years? A. 0 grams B. 4 grams C. 2.5 grams D. 20 grams
Answers
Answer:
[tex]\boxed {\boxed {\sf C. \ 2.5 \ grams }}[/tex]
Explanation:
We are asked to find how much of a 40 gram sample remains after 12 years.
Iron-55 has a half-life of 3 years. Therefore, after 12 years, 4 half-lives have been completed.
12 years/3 years = 4 half-livesEvery time a half-life is completed, half of the sample's mass decays. Remember we start with a 40 gram sample.
1 half- life: 40 g / 2 = 20 g 2 half-lives: 20 g / 2= 10 g 3 half-lives: 10 g / 2 = 5 g4 half-lives: 5 g / 2 = 2.5 gThere is also a formula that can be used to solve this problem.
[tex]A= A_o(\frac {1}{2})^{\frac{t}{hl}[/tex]
Where A₀ is the initial amount, t is the time, and hl is the half-life.
We know 40 grams is the inital amount, 12 years is the time, and 3 years is the halflife.
A₀= 40 g t= 12 hl= 3[tex]A= 40 \ g (\frac{1}{2})^\frac{12}{3}[/tex]
[tex]A= 40 \ g (\frac{1}{2})^4[/tex]
[tex]A= 40 \ g * 0.0625[/tex]
[tex]\bold {A= 2.5 \ g}[/tex]
After 12 years, 2.5 grams of Iron-55 will remain.
In order for natural selection to occur, organisms must (select all that apply) Check All That Apply have variation that can be passed from one generation to the next. have variation that can be passed from one generation to the next. have differential reproductive success. have differential reproductive success. survive longer than another organism. survive longer than another organism. compete for resources. compete for resources. have adaptations to their environment. have adaptations to their environment.
Answers
Answer:
have variation that can be passed from one generation to the nextsurvive longer than another organismhave adaptations to their environment. have differential reproductive success.Explanation:
Naturla selection is the survival and reproduction of individuals due to different phenotypes. The naturla selection represents a mechanism of evolution and changes in traits of species.In order for natural selection to occur, organisms must :
have a variation that can be passed from one generation to the next.have differential reproductive success.Natural Selection is a mechanism of evolution that occurs when there is a heritable variation for a trait and individuals with one version of the trait have greater reproductive success than do individuals with a different version of the trait.
In order for natural selection to occur, three conditions must be met:
There must be variation for the particular trait within a population.The variation must be inheritableIndividuals with one version of the trait must produce more offspring than those with a different version of the trait.Thus,
In order for natural selection to occur, organisms must :
have a variation that can be passed from one generation to the next.have differential reproductive success.Learn more:
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What are the effects of global warming on the earth over time?
Answers
which of the following statement about carbon dixoide is not true?
a.) increased carbon dioxide in the atmosphere increases the green house effect
b.) carbon dioxide is a greenhouse gas
c.) atmospheric carbon dioxide levels have slowly declined over the last 50 years
d.) burning fossil fuels can increase carbon dioxide levels in the atmosphere
Answers
Answer:
c is not true
Explanation:
c is correct answer because carbon dioxide have been increased not decreased
Help me please picture included
Answers
Answer:
umm I'm sorry but the picture is not coming like I mn its blank
Can someone please help me!
Answers
It is the site of gas exchange in the lungs.
Gas exchange occurs only in alveoli. Alveoli are made of thin-walled parenchymal cells, typically one-cell thick, that look like tiny bubbles within the sacs. Alveoli are in direct contact with capillaries (one-cell thick) of the circulatory system.
Which is the difference between an antibiotic and an antiviral?
Answers
Answer:
There are no options in this question, the options are as follows:
A. Antibiotics build up immunity, and antivirals increase white blood cells.
B. Antibiotics treat the symptoms, and antivirals destroy the causing organism.
C. Antibiotics are in liquid form, and antivirals are in mist form.
D. Antibiotics treat patients who have Staphylococcus, and antivirals treat patients who have the flu.
The answer is D
Explanation:
Specific drugs are used to curb infection or diseases caused by specific pathogens. An infection can be caused by either bacteria, virus or fungi. Considering their different mechanism of infection, viral infections are treated with the use of ANTIVIRAL DRUGS while bacterial infections are treated with the use of ANTIBIOTICS.
According to this question, staphylococcus is a bacterial genus and hence, patients with staphylococcus can be treated with antibiotics while flu is a viral disease, hence can only be treated with antivirals.
Answer:
A. Antibiotics build up immunity, and antivirals increase white blood cells.
Explanation:
edg
Which of the following is an example of an adaptation?
A. Ducks swim near the shore by a picnic area, where food is always available.
B. A dog walks without pulling on its leash.
C. Wolves work together to catch prey.
D. Birds living near a highway learn not to fly away every time a car passes.
(Zoom the picture for better quality)
Answers
Answer:
wolves work together to catch prey
The sticky mass in some chemicals on heating was known as _______________________ fibre or fibre _________.
Answers
Answer:
Americans chemical society
Which of the following BEST completes the analogy?
Answers
Answer:
there is nothing under the question.
Explanation:
Answer:
What are the options . comment
What mechanical layer lies above the core?
Answer here
Answers
Answer:
The mechanical layer that lies above the core is the mantle. It is a layer that is found after the core and is the second layer of the Earth. It is about 84% of the Earth's volume. It has a thickness of 2900 kilometers.
Waiting for your Prompt response.
What goes on during interphase?
Answers
Explanation:
During interphase, the cell grows (G1), replicates its DNA (S) and prepares for mitosis (G2). ... Interphase is the 'daily living' or metabolic phase of the cell, in which the cell obtains nutrients and metabolizes them, grows, replicates its DNA in preparation for mitosis, and conducts other "normal" cell functions.
During interphase, the cell grows and the nuclear DNA is duplicated. Interphase is followed by the mitotic phase. During the mitotic phase, the duplicated chromosomes are segregated and distributed into daughter nuclei. The cytoplasm is usually divided as well, resulting in two daughter cells
A scientist observes rock masses that have moved past each other in opposite horizontal directions. Which feature does the scientist observe?
plateau
syncline
strike-slip fault
fault-block mountai
Answers
Answer:
Strike slip fault
Explanation:
when it masses moved away against horizontal directions.
The group members met on Saturday working on the project together.
Which revision corrects the error in the sentence?
The group members who were working on the project together met on Saturday.
Working on the project together on Saturday, the group members met.
On Saturday, the group members who were working on the project met together.
The group members met working on the project together on Saturday.
Answers
Answer:
Working on the project together on Saturday, the group members met
Answer:
The answer is B.
Explanation:
The diagram below shows a light ray striking Medium A and Medium B at the same angle. (4 points)
A rectangle labeled Medium A is drawn on the left. A ray of light travels through air and strikes the surface of medium A making an angle of 50 degrees with the vertical. The light ray bends towards the vertical as it travels through Medium A and makes an angle of about 15 degrees with the vertical. A rectangle labeled Medium B is drawn on the right. A ray of light travels through air and strikes the surface of medium B making an angle of 50 degrees with the vertical. The light ray bends towards the vertical as it travels through Medium B and makes an angle of about 25 degrees with the vertical.
Which statement is correct?
The speed of the light ray is the same in air and Medium A.
The speed of the light ray is the same in air and Medium B.
Medium A and Medium B have different densities because light refracts at different angles.
Medium A and Medium B have the same density because the light ray strikes both at the same angle.
Answers
Answer:
A the speed of the light ray is the same in air and medium
