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