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