Why are rivers less productive than swamps? A. A swamp gets very little sunlight.
B. The water flow in rivers is too high.
C. A river is much smaller than a swamp.
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D. A swamp has very stagnant water.

Which statement is the best summary of the model? a-a series of aerobic and anaerobic reactions take place in cells b- the sun's energy moves through trophic levels in a food chain c-light energy is converted into stored chemical energy plants.d- food molecules are broken down in the cells if living things.