Fact 1: Zooplankton are tiny animals that feed on phytoplankton. Fact 2: Many zooplankton are crustaceans. Given the two facts above, answer the question "Some crustaceans feed on" with the following options: - phytoplankton - fungi - refraction of light - heat energy - an organism's body - carbon - algae - salt and water.
Answer:
phytoplankton