Final answer:
Phytoplankton are the base of aquatic food chains, serving as primary producers that are consumed by zooplankton.
Explanation:
Phytoplankton are the organisms that form the base of aquatic food chains. They are photosynthetic organisms that use sunlight and nutrients to produce food, making them essential primary producers in aquatic ecosystems. Zooplankton, as primary consumers, feed on phytoplankton in the food chain.
Learn more about aquatic food chains here:
https://brainly.com/question/37715492
