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