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