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