AP Biologymediummcq1 pt
Nutrient cycling differs from energy flow because nutrients
A.are reused through reservoirs and organisms
B.are destroyed after one use
C.only exist inside organisms
D.enter ecosystems only from space
Explanation
Core Concept
Unlike energy, which enters ecosystems and ultimately dissipates as heat, atoms such as carbon and nitrogen move among organisms and abiotic reservoirs and can be reused many times. Matter can also remain stored or sequestered in reservoirs for long periods, so 'recycled indefinitely' should not imply rapid or perfectly closed reuse.
Correct Answer
Aare reused through reservoirs and organisms
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