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