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