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