Recently discovered fossil remains strongly suggest that the Australian egg-laying mammals of today are a branch of the main stem of mammalian evolution rather than developing independently from a common ancestor of mammals more than 220 million years ago.
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Arather than developing independently from
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Brather than a type that developed independently from
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Crather than a type whose development was independent of
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Dinstead of developing independently from
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Einstead of a development that was independent of
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