Even though nitrogen constitutes 78% of the Earth\'s atmosphere, the amount avai

Question

Even though nitrogen constitutes 78% of the Earth's atmosphere, the amount available for living things nearly all comes from 1) a few groups of nitrogen-fixing bacteria 2) the breakdown of minerals 3) a few genera of detritivores 4) the breakdown of dead plants 5) nitrogen-containing fertilizers In a study on migrating salmon an ecosystem ecologist is most likely to ask a question on how 1) the salmon switch from an ocean to freshwater life 2) big the population is and what factors affect population growth 3) much phosphorus is being transferred to upstream areas 4) important are interactions with other species A _____cycle is a cyclic path that involves both biological and chemical processes of an ecosystem. 1) biogeochemical 2) complete 3) hydrophonic 4) complementary 5) symbiotic

Explanation / Answer

Question 36

Answer is (1) a few groups of nitrogen-fixing bacteria.

Question 37

Answer is (1) the salmon switch from an ocean to freshwater life.

Question 38

Answer is (1) symbiotic.

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