Zooplankton are tiny animals.
prokaryotes
the ocean
algae
zooplankton
Millions of cells
Thousands of cells
Hundreds of cells
A few dozen cells
eukaryotes
phytoplankton
drifting or wandering
plants
microscopic
aquatic (water-living)
Just for fun
To attract a mate
To see in the dark
To scare away predators
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).