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