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Sinking or subsiding air cannot form clouds due to the:
Australopithecine Fossils
Prehistoric remains of hominid species, belonging to the genus Australopithecus, that are among the earliest known human ancestors.
Million Years
A period of time equal to one thousand times one thousand years, often used to denote significant periods in Earth's geological and biological history.
Hominoids
A group of primates that includes all apes and humans, characterized by their lack of a tail and more complex brains.
Toumai
A nickname for Sahelanthropus tchadensis, one of the oldest known species in the human lineage, discovered in Chad, Africa dating to about 7 million years ago.
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