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Ozone layer is the layer. It contains tiny fraction of atmospheric mass.
Zooplankton
Zooplankton
Algae
Plankton
An abrasion is the medical term meaning scrape of the skin in which tiny blood vessels in the epidermis or outer layer of the skin break.
Tiny droplets of liquid water
coral reefs.
igneous rock
Cell
midichlorians
It is a tiny worm commonly found in hair that embeds it's self in the dermis layer of ones scalp. Tiny worm is not harmful but may be irritating.