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