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