Biology Quiz
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ECOSYSTEMS: INTERACTIONS, ENERGY, AND DYNAMICS
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Claim: Matter cycles, but energy does not cycle, in ecosystems.
A student lists observations:
1) CO2 levels are lower near plants during daytime and higher at night.
2) Heat is released from animals and from decomposing leaf litter.
3) The same carbon atoms can be found in plants, then in herbivores that eat them, and later in the soil after organisms die.
4) A food chain has fewer organisms at higher trophic levels.
Which pair of observations provides the strongest direct evidence for the claim as stated (one about matter cycling and one about energy not cycling)?
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