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