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