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