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