Correct Answer: Zooplankton

Solution : The correct option is Zooplankton .

Zooplankton is a diverse group of organisms that includes free-swimming and bottom-dwelling forms.

Some zooplankton, like copepods, move freely in the water, while others, such as certain larval stages or benthic species, can be found near the bottom of aquatic environments.

These organisms are a crucial component of aquatic food webs as they serve primary and secondary consumers.