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