please answer this:)) :((​

Answer:

I think the ans is no.a ok

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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.

Every time a half-life is completed, half of the sample's mass decays. Remember we start with a 40 gram sample.

There 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.

[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.

Answer:

humans try to modify environment factors to suit their needs. Limiting factors can be controlled in a specific area however, we can't control larger area. Like water or energy.

Answer:

Look at both of the file attachments

Answer:

there are six carbon atoms

Answer:

there are six carbon atoms

Answer:

Explanation:

HCl is produced by the parietal cells of the stomach. To begin with, water (H2O) and carbon dioxide (CO2) combine within the parietal cell cytoplasm to produce carbonic acid (H2CO3), which is catalysed by carbonic anhydrase. Carbonic acid then spontaneously dissociates into a hydrogen ion (H+) and a bicarbonate ion (HCO3–).

The hydrogen ion that is formed is transported into the stomach lumen via the H+– K+ ATPase ion pump. This pump uses ATP as an energy source to exchange potassium ions into the parietal cells of the stomach with H+ ions.

The bicarbonate-carbonic acid buffer works in a fashion similar to phosphate buffers. The bicarbonate is regulated in the blood by sodium, as are the phosphate ions. When sodium bicarbonate (NaHCO3), comes into contact with a strong acid, such as HCl, carbonic acid (H2CO3), which is a weak acid, and NaCl are formed. When carbonic acid comes into contact with a strong base, such as NaOH, bicarbonate and water are formed.

The bicarbonate ion is transported out of the cell into the blood via a transporter protein called anion exchanger which transports the bicarbonate ion out the cell in exchange for a chloride ion (Cl–). This chloride ion is then transported into the stomach lumen via a chloride channel.The respiratory system contributes to the balance of acids and bases in the body by regulating the blood levels of carbonic acid

Chloride ions are important in neutralizing positive ion charges in the body. If chloride is lost, the body uses bicarbonate ions in place of the lost chloride ions. Thus, lost chloride results in an increased reabsorption of bicarbonate by the renal system.

Answer:

both animals and plants are eukaryotic cells

Answer:

Animal cells have centrosomes (or a pair of centrioles), and lysosomes, whereas plant cells do not. Plant cells have a cell wall, chloroplasts, plasmodesmata, and plastids used for storage, and a large central vacuole, whereas animal cells do not.

Explantion

Animal cells

Animals are made up of millions of cells. Animal cells have an irregular structure and are made up of four key parts:

Nucleus – This contains genetic material (DNA), and controls the cell's activity.

Cell membrane – A flexible layer that surrounds the cell and controls the substances that enter and exit.

Cytoplasm – A jelly-like substance where the chemical reactions happen.

Mitochondria – This is where energy is released from the food molecules

Plant cells

Plants are also made up of millions of cells. Plant cells have a nucleus, cell membrane, cytoplasm and mitochondria too, but they also contain the following structures:

Cell wall – A hard layer outside the cell membrane, containing cellulose to provide strength to the plant.

Vacuole – A space inside the cell that is used to store substances and help the cell keep its shape.

Chloroplasts – Structures that contain the green pigment chlorophyll, which are a key part of photosynthesis.

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Answer:

A.Species

B.Genus

C.Phylum

D.Kingdom

Answer: unconditioned stimulus = dancing bear

unconditioned response = baby turns head

conditioned stimulus = red circle

conditioned response = baby turns head

neutral stimulus = red circle

response to neutral stimulus = baby does not turn head

Explanation:

The unconditioned stimulus is the stimulus that occurs naturally without any prior learning.

The unconditioned response refers to an unlearned response which happens naturally and which occurs due to the unconditioned stimulus.

The conditioned stimulus is the stimulus that occurs due to prior learning and the conditioned response follows.

Based on the above definition, the answers to the questions will be:

• unconditioned stimulus = dancing bear

• unconditioned response = baby turns head

• conditioned stimulus = red circle

• conditioned response = baby turns head

• neutral stimulus = red circle

• response to neutral stimulus = baby does not turn head

Answer:

plants uses carbon dioxide during photosynthesis. plants use carbon to make carbohydrates and cellulose. animals then eat plants and carbon is passed down. Animals then respire and release carbon dioxide into the atmosphere.

Answer:

Plants uses carbon dioxide during photosynthesis. Plants use carbon to make carbohydrates and cellulose. Animals then eat plants and carbon is passed down. Animals then respire and release carbon dioxide into the atmosphere.

Answer:

These have been caused by many natural factors, including changes in the sun, emissions from volcanoes, variations in Earth's orbit and levels of carbon dioxide (CO2). Global climate change has typically occurred very slowly, over thousands or millions of years.

Explanation:

According to me there are several causes of climate change, but all the problems are based upon a major problem which is over population. Either it is deforestation, any kind of pollution, global warming or whatever it is, all these problems are inter-linked and all are due to increasing population.

Answer:

Photosynthesis, chloroplast

Explanation:

Answer:

photosynthesis is the process in which plant make food by themselves from using sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar.

Answer:

Photosynthesis is a process through which plants and other organisms transform light energy into chemical energy, which is then released to power the organism's metabolic processes through cellular respiration.

OAmalOHopeO :)

Answer:

Starch.

Glycogen.

dextran.

Inulin.

Cellulose.

Chitin.

Pectin.

Explanation:

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Answer:

The correct answer is - B. disruptive selection.

Explanation:

Adaptive radiation is a type of genetic drift that relatively fast evolution of many species from a single common ancestor which means there is a big drift in a very small time.

Disruptive selection is a type of natural selection that shows phenotypes (individuals with groups of traits) of both extremes but has very few individuals in the middle. An example of this type is the evolution of mammals after the extinction of dinnosaurs.

Answer:

neutral?

Explanation:

Answer:

D. When there is no competition

Explanation:

If there is no competition in a population, exponential growth can occur.

Without competition, resources are not limited and a population can grow rapidly.

With limited resources, a high death rate, and a reached carrying capacity, population growth is strongly limited and cannot grow at an exponential rate.

So, answer choices A, B, and C are all incorrect.

The correct answer is D. When there is no competition

Answer:

B. Gestation period

Explanation:

Gestation, in mammals, the time between conception and birth, during which the embryo or fetus is developing in the uterus. This definition raises occasional difficulties because in some species (e.g., monkeys and man) the exact time of conception may not be known.

Answer:

Environmental causes of variation

Characteristics of animal and plant species can be affected by factors such as:

climate

diet

accidents

culture

lifestyle

For example, you will become heavier if you eat too much food, and you will become lighter if you eat too little. A plant in the shade of a big tree will grow taller as it tries to reach more light.

Answer:

Many factors can contribute to growth variation across and among populations such as genetic factors, nutrition, environmental conditions, social conditions, and cultural conditions ,Internal and external environmental factors, like gender and temperature, influence gene expression. Similarly, drugs, chemicals, temperature, and light are among the external environmental factors that can determine which genes are turned on and off, there by influencing the way an organism develops and functions.

Answer:

Reproduction is one of the most important characteristics of living beings, because -

- The existence of any species is dependent on the reproduction because no living being is immortal.

After death of a being of one generation,the existence of that died being is completed by the newborns of the next generation.

And,the birth of newborns of next generation is only possible by the reproduction.

- The variation and mutation in the biological characteristics is often necessary which is only possible by reproduction through many generations.

- When a living being becomes old, it's become unable to do normal tasks like collection of food, finding shelter etc,at that moment,the newborns of next generation do the necessary jobs.

And as mentioned before,these newborns are only possible due to reproduction.

Hello

first of all we know that an ecosystem is a biological system made up of a community of living organisms (biocenosis) and the physical environment where they are related (biotope). It is a unit composed of interdependent organisms that share the same habitat. Ecosystems often form a series of chains that show the interdependence of organisms within the system. It can also be defined as follows: "An ecosystem consists of the biological community of a place and the physical and chemical factors that constitute the abiotic environment." Abiotic and biotic factors are considered to be linked by trophic chains, that is, the flow of energy and nutrients in ecosystems.

This concept, which was introduced in 1935 by the English ecologist AG Tansley, takes into account the complex interactions between organisms (e.g. plants, animals, bacteria, protists and fungi) that form the community (biocenosis) and the energy flows and materials that pass through.

In more understandable terms, the ecosystem is not a place as such.

Answer: cells, chlorophyll, nucleus, chromosomes, organelles, interphase, endoplasmic

Answer: Exponential

Explanation:

The main requirement for the population of a species to grow is food. When there is food, a organisms that are born will be able to live longer because food will be able to sustain them.

This is what happened with humans during the Neolithic Revolution when we began farming.

The general trend is that the more food that is available, the higher the population growth. When these butterflies arrived and found no competition for food, their population would increase in the highest way possible which is exponentially because there would be plenty of food to go around.

Answer:

Exponential growth

Explanation:

Without any competition for food or space, the butterfly species likely experienced exponential growth.

The lack of competition would have allowed the population to flourish, as they would have excess amounts of resources, food, space, and other limiting factors.

So, they most likely exhibited exponential growth.

Answer:

A. donation of excited electrons by chlorophyll a to a primary electron acceptor

Explanation:

Photosystems are structures located at the thylakoid membrane that act to harvest energy light in order to convert it into chemical energy. Each photosystem is composed of a light-harvesting complex and a core complex, which in turn is composed of a reaction center. The photosynthetic reaction centers are multi-protein complexes that use light energy to catalyze the electron transfer across the chloroplast thylakoid membrane against a thermodynamic gradient. Moreover, antenna pigments are pigments that capture the energy from photons in order to transfer energy to other pigments in the photosystem (e.g., chlorophyll B and carotenes are antenna pigments, whereas chlorophyll A is the core pigment). Light energy absorbed by antenna pigments in the photosystems is transferred to the reaction center chlorophyll A molecules, thereby exiting electrons in the reaction center. A reaction center consists of two chlorophyll A molecules, which donate electrons to the primary electron acceptor.

Answer:

The waves have the same frequency because they have the same amplitude.

Explanation:

There are some factors which affect the rate of diffusion. These are:-

The partial pressure of oxygen.

The partial pressure of carbon dioxide.

Temperature.

The concentration of gases.

The thickness of the membrane.

hope this helps you

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Answer:

the thickness of membrane

Answer:

Explanation:

The appropriate answer is 'space filling models do not identify the number and type of bonds'. A space filling model is one type of three dimensional (3D) molecular model used to represent molecules of different chemical compounds. The structure of this type of arrangement shows that, for example, two elements are bonded but it does not show if it is a single, double or triple bond.