Phytoplankton are the first link in the entire food chain
Tiny plants (phytoplankton) are eaten by minute animals (zooplankton). These are eaten by small fish which are in turn eaten by larger fish. Humans catch and eat the fish.
Tiny plants (phytoplankton) are eaten by minute animals (zooplankton). These are eaten by small fish which are in turn eaten by larger fish. Humans catch and eat the fish.