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