The tiny free floating weakly swimming algae and animals that occur in both freshwater saltwater environments are called?

The tiny free floating weakly swimming algae and animals that occur in both freshwater saltwater environments are called plankton. Plankton are a diverse group of organisms that include phytoplankton, zooplankton, and neuston. Phytoplankton are plant-like organisms that can photosynthesize, while zooplankton are animal-like organisms that graze on phytoplankton and other small organisms. Neuston are organisms that live at the surface of the water, including insects, spiders, and some crustaceans.