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