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