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