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