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