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