Zooplankton are tiny animals.
eukaryotes
zooplankton
prokaryotes
phytoplankton
All plankton are microscopic (too small to see without a microscope).
Hundreds of cells
Millions of cells
Thousands of cells
A few dozen cells
Just for fun
To scare away predators
To attract a mate
To see in the dark
it makes the water more acidic.
it makes the water saltier.
it kills large predators like sharks.
the ocean
algae
microscopic
plants
drifting or wandering
aquatic (water-living)