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