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