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