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