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