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