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