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