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