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