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