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