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