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