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