Energy Flow Through Ecosystems

AP Biology· difficulty 2/5

Carbon enters the food web from the atmosphere via

A
$Volcanic outgassing (CO₂ \to carbonate rocks during weathering)$
B
$Photosynthesis (CO₂ \to organic carbon in producers)$
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C
$Cellular respiration (organic C \to CO₂ released by consumers)$
D
$Decomposition (organic C \to CO₂ released by microbial activity)$

Explanation

Photosynthesis pulls atmospheric CO₂ into biomass; respiration and combustion release it back.

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