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