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