Please answer the following question: Fact 1: Zooplankton are tiny animals that feed on phytoplankton. Fact 2: Diatoms are the predominant phytoplankton. Given the two facts above, answer the question "Zooplankton are tiny animals that feed on what?" with the following options: - sunlight - vegetation - Energy - loose soil - plant life - diatoms - fungi - chemicals
A:
diatoms