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