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