Question

which of these is a heterotroph? plant producer consumer phytoplankton

Explanation:

A heterotroph is an organism that cannot produce its own food and relies on consuming other organisms. Plants and phytoplankton are producers (autotrophs) as they make their own food via photosynthesis. Producers are autotrophs. Consumers, however, obtain energy by eating other organisms, so they are heterotrophs.

Answer:

C. consumer