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