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