Question

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Answer 1

1. The movements of energy and nutrients through living systems are different because (1 point)

energy flows in one direction, and nutrients recycle.
energy is limited in the biosphere, and nutrients are always available.
nutrients flow in one direction, and energy recycles.
energy forms chemical compounds, and nutrients are lost as heat.

2. Which of the following depends on bacteria? (1 point)

conversion of dead organic matter to fossil fuel
photosynthesis
dissolution of phosphates from rock
nitrogen fixation

3. Which of the following is a correct statement? (1 point)

Decomposition is an important part of only two of the three nutrient cycles.
The nutrient cycles contain paths of elements through the living world but not through the
nonliving world.
Living organisms are able to convert inorganic forms of carbon, nitrogen, and phosphorus
into organic forms.
The atmosphere represents an important reservoir for organic forms of carbon and nitrogen.

4. Because of biogeochemical cycling (1 point)

human activity has no effect on elements, chemical compounds, and other forms of matter.
living organisms are not limited by any one nutrient.
nutrients are circulated throughout the biosphere.
many nutrients do not reach toxic concentrations in the biosphere.

Answer 2

@Yetter

Answer 3

1) Nutrients cycle through ecosystems because the earth is a closed system with regards to nutrients. So, we don't get any new input of carbon, nitrogen, water, etc. (except for some minimal input from meteors).

Energy, however, does not cycle - it flows. This is because every time energy changes form (like from radiant to chemical or goes from one organism to the next), the transfer is not very efficient. Only about 10% actually makes it to the next stage. The rest is lost as entropy. This means that we need a continual input of energy, which we get from the sun. With regards to energy, then, the earth is an open system.
2) Nitrogen Fixation: the chemical processes by which atmospheric nitrogen is assimilated into organic compounds, esp. by certain microorganisms as part of the nitrogen cycle.
3) Living organisms are able to convert inorganic forms of carbon, nitrogen, and phosphorus
4) nutrients are circulated throughout the biosphere.

Answer 4

Thank you @beccaboo333