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The Earth's atmosphere has no definite boundary, slowly becoming thinner and fading into outer space. Three-quarters of the atmosphere's mass, however, is contained within the first 11 km of the planet's surface.
Emus have brown to grey-brown plumage of shaggy appearance; the shafts and the tips of the [[feather]]s are black. (Compare with a statement about a different part of the body, which might have a full-stop.)
Solar radiation is absorbed by the tips, ===Exercise 4: commas===
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