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