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