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