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