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