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