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