“As zooplankton rebounded, so did native mussels and clams. Scientists anticipate some fish species will rebound too as their food supply increases.” What conclusion can you draw about zooplankton based on this evidence?

Zooplankton eat native mussels, clams, and some fish species.
Zooplankton are similar organisms to certain mussels and clams.
Zooplankton are an important food source for native mussels, clams, and fish.
Zooplankton are a more important food source for most species than phytoplankton.