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BIOL 120 Lesson 15 Assignment

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Answer each of the following questions as completely as possible. Your answers should be no longer than a few sentences.


(10 pts) 1.      What is the role plants play in ecosystems? How are they involved in the cycling of nutrients and the flow of energy?


(15 pts)  2.      Define the terms ecosystem, habitat, niche, and biome.


(15 pts)  3.      Name two major biogeochemical cycles. Draw out your own representation of the carbon cycle.


(10 pts)  4.      Describe what is meant by the greenhouse effect. How do plants and humans impact the carbon cycle? Why are people concerned about increasing levels of carbon dioxide in the atmosphere?


(10 pts)  5.      What are the two laws of thermodynamics? How is it that life on earth can exist in an ordered way?


(15 pts)  6.      Define the terms producer and consumer. What are the major types of consumers? Describe your own representation of a food web.

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