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