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