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