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