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