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According to researchers, oxygen levels in the Earth's atmosphere "fluctuated wildly" one billion years ago, creating conditions that could have accelerated the development of early animals.
Our work reveals that Chernobyl tree frogs have a much darker colouration than frogs captured in control areas outside the zone.
A sweet tooth is a trait shared by many mammals, but birds' sweet receptor was lost during evolution.
The strength of a theory can be gauged by how well it stands up to attacks and how well it incorporates new evidence.
According to a recent study from The Australian National University, the raw material for evolution is significantly more abundant in wild animals than previously thought.