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