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