To attract a mate
To see in the dark
To scare away predators
Just for fun
prokaryotes
phytoplankton
eukaryotes
zooplankton
the ocean
algae
Millions of cells
Thousands 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
Zooplankton are tiny animals.
it kills large predators like sharks.
it makes the water saltier.
it makes the water more acidic.