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