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