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