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