Question

in a food chain, which organisms release the carbon from dead things back into the environment?
a. decomposers
b. producers
c. scavengers
d. consumers

Explanation:

To solve this, we analyze each option:

• Option A (Decomposers): Decomposers (like fungi, bacteria) break down dead organic matter. During decomposition, they release carbon (and other nutrients) back into the environment (e.g., soil, air) through processes like respiration.
• Option B (Producers): Producers (e.g., plants) make their own food via photosynthesis and take in carbon (as \( \text{CO}_2 \)) to build organic matter, not release carbon from dead things.
• Option C (Scavengers): Scavengers (e.g., vultures) eat dead animals but do not fully decompose the matter to release carbon back into the environment in the same way decomposers do; they consume for energy, not decomposition.
• Option D (Consumers): Consumers (e.g., animals) eat other organisms and release carbon via their own respiration, but they do not break down dead matter to release its carbon back into the environment.

Thus, decomposers are responsible for releasing carbon from dead things back into the environment.

Answer:

A. Decomposers