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