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