22. which organism fixes most of the nitrogen in the atmosphere?
23. the exchange of carbon dioxide between the atmosphere and the ocean occurs mostly by which
physical process?
24. cellular respiration places carbon dioxide back into the atmosphere from these organisms
25. what is the main way nitrogen is incorporated in animal tissue?
26. the paths of water, carbon, nitrogen, and phosphorus pass from the nonliving environment to
living organisms and back to the nonliving environment in closed circles called
27. what is the process of physical and chemical forces releasing minerals from rocks?
28. plant roots can
break down rocks and minerals.
29. what is the process of removing a natural substance from an ecosystem faster than it can be
replaced?
30. draw and label a complete food chain using examples of real organisms. include the following
terms: autotrophs, heterotrophs, primary producers, primary consumers, secondary consumers.
tertiary consumers, decomposers, detrivores, herbivores, camnivores, and carnivores.