Question

which organisms in a food web feed on the primary consumers?
primary producers
secondary consumers
phytoplankton

Explanation:

To determine which organisms feed on primary consumers, we analyze each option:

• Primary producers (e.g., plants, phytoplankton) make their own food via photosynthesis/chemosynthesis and do not feed on consumers.
• Secondary consumers are organisms that eat primary consumers (herbivores, which are primary consumers).
• Phytoplankton is a type of primary producer, so it does not feed on consumers.

Thus, secondary consumers feed on primary consumers.

Answer:

B. secondary consumers (assuming the option labels are A. primary producers, B. secondary consumers, C. phytoplankton; adjust labels if needed, but the correct concept is secondary consumers).