The Cretaceous–Paleogene (K–Pg) extinction event (also known as the Cretaceous–Tertiary (K–T) extinction) was a sudden mass extinction of three-quarters of the plant and animal species on Earth, approximately 66 million years ago.
All of these birds share a common ancestor
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As Earth orbits the Sun, this same principle is used by astronomers to determine the distance to nearby stars. ... Parallax is the first "inch" on the yardstick with which astronomers measure distances even further to objects.
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A.Testable hypotheses
it makes the most sense out of the rest
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Shelter and settlement forms in hot humid, hot dry and cold climatic zones have been described. Performance efficiency of passive climate control systems of vernacular buildings have been analysed and their relevance to contemporary design and planning of housing and new towns in selected regions are examined. A comment is also made on the role of climate in the interaction between settlements and their hinterland.
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