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