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