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