Please answer the following question: Fact 1: Zooplankton are tiny animals that feed on phytoplankton. Fact 2: Planktonic plants are called phytoplankton. Given the two facts above, answer the question "what do zooplankton feed on?" with the following options: - planktonic plants - Chemical energy - animals - microorganisms - NaCl - Chlorophyll - insects - an area swollen with pus
A:
planktonic plants