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