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