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5. why are ecological pyramids shaped as pyramids? (1 point)
because there is a large decrease in the amount of energy or biomass as you move from one trophic level up to the next
because the movement of energy through the biosphere follows a path similar in shape to a pyramid
because decomposers form a wide base of support at the bottom of a food web similar to the base of a pyramid
because a pyramid represents a stable building form that is similar to the structure of a stable ecosystem
6. what is true of matter in ecosystems? (1 point)
nonliving things are essential for carrying out the chemical transformation of certain elements so that living things can use them.
living things can recycle elements within an ecosystem as long as decomposers are present.
matter flows in a one-way direction with a 10% loss at each move up in trophic level.
elements continuously cycle between the physical environment and living organisms.
7. which of the following is a food chain in the food web shown in figure 3–4?
(1 point)
tree, rabbit, hawk, snake
grass, grasshopper, snake, hawk
grass, caterpillar, robin, hawk
tree, deer, mountain lion, fox
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5. why are ecological pyramids shaped as pyramids? (1 point)
because there is a large decreas...
because there is a large decreas...
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