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