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