Answer:
False
Explanation:
The cells of collenchyma have evenly thickened cell wall
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False.. The cells of sclerenchyma have evenly thickened cell wall due to deposition of lignin.. Collenchyma cells are thickened at the corner due to pectin..
Why has the number of people in the world increased if the human population growth rate has decreased?
Answer:
Life expectancy has steadily risen.
People live longer lives.
To understand the reasons why the number of people in the world has increased and the population growth rate has decreased, it is necessary to understand how the world's demographic growth rate is calculated.
The calculation is made from the balance between the total number of people alive and the total number of deaths that occurred in a period of time.
Therefore, we can understand that the population growth rate has decreased due to several relevant factors, such as:
Increased life expectancy.The decrease in infant mortality.Rising fertility rates.Urbanization.Economic development.These are some of the reasons that help us understand why population numbers increase and population growth rate decreases.
Economic development, new technologies and a better quality of life for the population are directly related to the decrease in the population growth rate.
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Which animal population do scientists frequently study in order to identify specific ways to evaluate the impacts of contaminants on biological communities?
a. bottlenose dolphins
b. giant tortoises
c. mallard ducks
d. swan geese
Answer:
mallard ducks I think so
Answer:
D.
Explanation:
Galapagos tortoises have been and continue to be threatened by predation and habitat destruction from invasive species, and increasing human
Which of these statements is true about autotrophs, but not heterotrophs?
They use sugar and oxygen to make carbon dioxide and water.
They use chlorophyll and oxygen to make carbon dioxide and water.
They use sunlight, water, and carbon dioxide to make sugars.
They use sunlight, water, and oxygen to make chlorophyll.
Answer:
3rd one i think
Explanation:
autotrophs make own food
think about the photosynthesis equation which requires lights, co2 and water to make glucose
A common genetic mutation that lowers levels of the enzyme cathepsin C severely reduces a person’s ability to ward off periodontitis, or gum disease. The enzyme triggers immunological reactions that destroy diseased cells and eliminate infections
in the mouth. But researchers are developing ways to restore the enzyme to normal levels. Once that happens, we will be able to eliminate periodontitis.
Which one of the following is an assumption on which the argument depends?
(A) Restoring cathepsin C to normal levels is the only way to eliminate periodontitis.
(B) Genetic mutation is the only cause of lowered levels of cathepsin C.
(C) Researchers will soon succeed in finding means of restoring cathepsin C to normal levels.
(D) Persons who do not have the genetic mutation that lowers levels of cathepsin C do not get gum disease.
(E) A person whose cathepsin C level has been restored to normal will not suffer from periodontitis.
Answer:
(E) A person whose cathepsin C level has been restored to normal will not suffer from periodontitis.
Explanation:
Considering the fact that there may be some other causes of periodontitis aside from the lowered levels of the enzyme.
Therefore, should there be some other causes of periodontitis, hence, it can be concluded the process of restoring the enzyme to normal levels might not be sufficient for eliminating periodontitis.
Hence, the author's argument is solely based on this assumption, and option. Hence, option (E) is the correct answer.
Trees grow more quickly in the ________ than the ________, and the tree rings show up as ________ colored bands.
summer, winter, darker
summer, winter, lighter
winter, summer, lighter
winter, summer, darker
Answer:
Its summer, winter, darker.
Explanation:
This is the answer I hope it helps you out.
Trees grow more quickly in the summer than in the winter, and the tree rings show up as darker colored bands.
What are seasons?A season exists the year that stands determined by particular climate conditions. The four seasons—spring, summer, fall, and winter—follow one another regularly. Each includes its light, temperature, and weather designs that repeat yearly.
Summer exists the hottest of the four temperate seasons, happening after spring and before autumn. At or centered on the summer solstice, the earlier sunrise and latest sunset happen, daylight hours exist longest and dark hours exist shortest, with day length falling as the season progresses after the solstice.
Winter, the coldest season of the year, between autumn and spring; the name arrives from an old Germanic word that represents “time of water” and guides to the rain and snow of winter in middle and increased latitudes.
Hence, Trees grow more quickly in the summer than in the winter, and the tree rings show up as darker colored bands.
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write the four names of disease,causative agent,disease spread mechanism, precautions.
give the correct answer.
Explanation:
hhxuxjxcjieidie you doing today I don't euheudux ruurjf don't know e u you have uhcjfudjrjfju jfjfjfjfjjffj y I will call him tomorrow is fine with Grace to call you back I don't think so much and have been in contact and o I don't think so I have no clue how was the office and they are going home for the holidays so much energy and o o to working together you are welcome dear I will
All organisms need a place to live that provides? I
Answer:
food shelter water
Explanation:
food shelter water
Bacteria are organisms that reproduce asexually. How is it better for them than reproducing sexually.
Answer: they don't have a reproductive system
Explanation:
a ___ is made up of nonliving pieces of DNA or RNA wrapped in a protein shell.
A pathogen is made up of nonliving pieces of DNA or RNA wrapped in a protein shell.
Answer:
Virut
Explanation
Nhìn chung các loại virus bao gồm các phần cấu tạo sau:
- Lớp vỏ protein
- Bên trong là nucleic acid (DNA hoặc RNA).
- Một số loại virus có màng bao
Identify the biotic factor of an ecosystem from the following
Answer:
Ecosystems are influenced by both biotic and abiotic factors. Biotic factors include animals, plants, fungi, bacteria, and protists. Some examples of abiotic factors are water, soil, air, sunlight, temperature, and minerals.
Which is one function of steroids
Steroids have a number of different functions but essentially all act as hormones in the body.
which one produces proteins?
Answer:
Ribosomes are complex molecular machines in living cells that produce proteins from amino acids in a process known as protein synthesis or transformation. The process of protein synthesis is a primary function performed by all living cells.
So I think the answer is ribosome
Explanation:
Select all the correct answers. Which two examples may be converted into fossil fuel after being buried under pressure for a long period of time?
Answer:
Coal and petroleum.
Explanation:
Coal and petroleum are the two examples that can be converted into fossil fuel after being buried under pressure for a long period of time. Both coal and petroleum formed underground with the presence of very high temperature and pressure. Coal is formed when the plant material is placed under high temperature and pressure for thousand of years while on the other hand, petroleum formed when dead bodies of animals are present underground for a very long time with a suitable pressure and temperature turn into petroleum.
While you and your little cousin are walking through a natural history museum, she points out the skull of an australopithecine with a large crest on the top and asks you what its purpose was. How might you correctly sum up this complicated evolutionary trait for your little cousin
Answer:
The purpose of the crest was to provide a surface for masticatory muscle attachment or insertion.
Explanation:
This crest is called the sagittal crest. It is present in extinct hominids, such as Australopithecus and Paranthropus, and can also be found in living animals such as gorillas or lions and some reptiles.
The sagittal crest is a bony structure that crosses the hominids´ skull longitudinally, and it is so well-developed that it stands out notoriously.
This crest, like others in the skulls, provides an attachment surface for many muscles. In the particular case of the sagittal crest, it is believed to provide an insertion area to mastication muscles.
It seems that Australopithecus had a special diet composed of tough items. The hominid probably needed to strong bite while eating. The strong jow muscles gave them the possibility to bite but needed a wide area for insertion. The sagittal crest provided that wide surface. There was a direct relationship between the size of the crest and the muscle mass. The bigger the crest was, the more developed the muscle was.
It is believed that in living animals, such as gorillas, the development of the crest in males is for sexual selection and reproductive success. The bigger the crest is, the more attractive the male is, and the more chances to be selected by the female to mate it will have. Some hypothesize that the development of the crest in Australopithecus could also be related to sexual selection.
Orcas, or killer whales, are natural predators of sea otters. It has been observed that in regions where the sea otters are not present, sea urchins grow rapidly and destroy much of the natural kelp vegetation. Which of these statements is correct in this context?
Answer:
D) Sea otters are a keystone species as they prevent a herbivorous species from completely destroying a plant species.
Explanation:
Cerebrospinal fluid (CSF) is formed by capillary knots called the ________________________, which hangs inside the ________________________ of the brain. Ordinarily, CSF flows from the lateral ventricles into the ____________ ventricle and then through the _______________ into the fourth ventricle. Some of the fluid continues down the ________________________ of the spinal cord, but most of it circulates into the ________________________ by passing through three tiny openings in the walls of the ________________________. As a rule, CSF is formed and drained back into the venous blood at the same rate. If its drainage is blocked, a condition called ________________________ occurs, which results in increased pressure on the brain.
Answer:
1. Choroid Plexuses
2. Ventricles
3. third
4. Cerebral Aqueduct
5. Central Canal
6. Subarachnoid space
7. Forth Ventricle
8. Hydrocephalus
Explanation:
Cerebrospinal fluid formed by capillary knots called Choroid Plexuses which is hanged inside ventricles. There are four ventricles in which CFS flows from lateral to third and from cerebral aqueduct to forth ventricle. The meninges covers spinal cord which extends more inferiority to form a sac from which cerebrospinal fluid can be withdrawn without damage to spinal chord.
Which organism in the food web below is found in the first trophic level of the
ecosystem?
A. Fungus
B. Strangler fig
C. Fruit bat
D. Sloth
Fungus is the organism in the food web displayed in the image in the first trophic level of the ecosystem.
What is trophic level?Trophic level is defined as the position of an organism in the food chain or food web.
The trophic level consists of organisms at different levels. The first trophic level is made up of producers that initiate the transfer of energy.
According to this question, an image showing a food web is given. The first trophic level in this food web is the fungus because it starts the energy transfer.
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urgent please answer
The correct answer is DNA WITHOUT HISTONES.
Explanation:
Prokaryotes are unicellular organisms without membrane-bound organelles. They lack a true nucleus. Instead, they have nucleoid, a genetic material without the nuclear envelope. In prokaryotes, the genetic material is single circular double-stranded DNA without histones. Thus, the correct answer is 'DNA without histones.'
Answer:
the correct answer is 'DNA without histones.'
Explanation:
You treat a sample of DNA with DNase and run the digested fragments out on an electrophoretic gel. You found mostly long fragments. What can you conclude about this sample of DNA
Answer:
the sample contains mostly heterochromatin
Explanation:
Heterochromatin refers to a highly condensed state of DNA, whereas euchromatin is lightly packed. It is for that reason that heterochromatin is associated with a transcriptionally inactive state, whereas euchromatin regions are active for transcription. Heterochromatin regions resist DNases because these enzymes don't cut DNA randomly, but they show sequence preference. In consequence, highly repetitive DNA heterochromatin regions (e.g., centromeres, telomeres, etc) may exhibit resistance to DNA cleavage.
The theory of natural selection states that
Answer:
Natural selection is a mechanism of evolution. Organisms that are more adapted to their environment are more likely to survive and pass on the genes that aided their success. This process causes species to change and diverge over time.
Explanation:
Which is NOT involved at the beginning
of a nerve impulse?
A. reaching the threshold
B. strong stimulus
C. sodium leaving the cells
D. negative charge inside the cell
Answer: the answer would be C
Sodium ion do not leave at the beginning of the nerve impulse.
They leave after the gated channel opens up after receiving a stimulus.What is a nerve impulse? It is an electrical signal that travels along a nerve fiber in response to a stimulus and serves to transmit record of sensation from a receptor or an instruction to act to an effector.Nerve impulse begin at dendrite and then move toward the cell body of neuron.To know more about nerve impulse here
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It’s not A it’s wrong dose anyone know the answer
Answer:
its c i think its ok ok I can u send the
Explanation:
i think
I need help answering this
Answer:
A. 100%.
Explanation:
Since both spiders have either AA or aa, every possible combination would result in an Aa genotype. And, because A is dominant to a, they will all display the A trait—be patterned instead of plain.
So it is 100%.
1. What are the four components of Physical Fitness?
Explanation:
Muscular Strength
Muscular endurance
Flexibility
Body Composition
What do we call the likelihood that in event will occur
Answer:
It's Called Probability.
Explanation:
Why Nepal is favourable for sericulture?
Answer:
Why Nepal is favourable for sericulture
Explanation:
Mysuru and North Bengaluru in Karnataka are famous for their silks and are called the “Silk City” as they majorly contribute to the silk production in India
Which type of cell adhesion is useful for anchoring cells together and defending against shear forces on tissues
Answer:
Desmosomes
Explanation:
Desmosomes are cellular structures that adhere to neighboring cells. Its function is to hold the epithelial cells together, associating the intermediate filament cytoskeletons of neighboring cells, thus forming a transcellular network with high resistance to mechanical traction. It thus allows the cells to maintain their shape and the epithelial sheet to exist in a stable form. Inside cells act as anchoring sites for intermediate rope-shaped filaments, which form a structural network in the cytoplasm providing a certain rigidity. Through these junctions the intermediate filaments of the adjacent cells are indirectly connected forming a continuous network that extends throughout the tissue.
In a population of wild bees, a mutation resulted in slightly larger wingspan in some of the bees. This larger wingspan made the bees more efficient in their flights to flowers to collect nectar. Thus, these bees became more successful. This trait was passed on to offspring, and eventually the larger wingspan variety of bee replaced their smaller-winged relatives completely. It could be said that ____ favored the bee with the larger wingspan, and so the ____ evolved
Answer:
The correct answer is - natural selection, population.
Explanation:
In this case, the wild bees population experienced a mutation which helps in become more eeficient to fight for nector. This bees population is more sucessful to other that didnt recieved mutation and this mutation as it is adavtageous.
Natural selection always favored beneficial traits for the organisms to eveolved in generation therefore, these population is more succesful and replaced the short winged bees.
Molecules that do not contain carbon are called inorganic.
true
false
Answer: true
Explanation:
it does contain carbon
Organic molecules contain carbon and inorganic molecules do not contain carbon. Organic molecules are synthesized by living things and inorganic molecules are not. Organic molecules are consumed by living things and inorganic molecules are not. All organic molecules contain carbon, bonded to other elements.
So true.
Describe the difference between a benign and malignant tumour
Answer:
Explanation:
A benign tumor isn’t cancerous while a miligment tumor is
