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