Jalen observes a pond ecosystem near his home and records the changes he observes over a season for his science project. Ecosystems have important value for the organisms within them.
Which of the following determines whether an ecosystem is healthy? Choose the two that apply.
A.
a food chain with several members
B.
the number of organisms in an area
C.
the variety of species in an area
D.
many natural resources
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c
explanation:
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Where’s the graph 0.0
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i think the answer would d
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We can use solar powered cars or ride bikes instead of cars that burn fossil fuels
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