Question

based on this food web, which primary consumers eat mostly phytoplankton? bald eagle tundra swan zooplankton

Explanation:

Primary consumers eat producers (like phytoplankton, which is a producer). Bald Eagles are typically tertiary or secondary consumers (carnivores eating other animals). Tundra Swans may eat aquatic plants or other producers but not primarily phytoplankton. Zooplankton are primary consumers that often feed on phytoplankton.

Answer:

C. Zooplankton