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