AP Biologyeasymcq1 pt
In a food chain, energy flows from
A.producers to consumers, decreasing at each level
B.consumers to producers in a cycle
C.equally through all levels
D.from decomposers upward only
Explanation
Core Concept
Energy enters most ecosystems through primary producers and is transferred to consumers through feeding. Only a fraction of the energy available at one trophic level becomes biomass available to the next; much is used in metabolism, dissipated as heat, excreted, or remains in uneaten material that can enter detrital pathways. The commonly taught 10% rule is an approximation, not a fixed law.
Correct Answer
Aproducers to consumers, decreasing at each level
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