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