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a layer of ozone gas which occurs naturally in the upper atmosphere, and protects life by absorbing harmful ultraviolet radiation.
involuntary muscle found in the walls of blood vessels, in digestive, respiratory, urinary and...
all the ecosystems on the Earth, all the species within these ecosystems and the genetic...
an informal term for any living species which appears to be the same as a species otherwise only...
the main vein that returns deoxygenated blood from the lower parts of the body to the right...