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