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