Scientists Study Inner Ear to Determine Beginnings of Mammals - VOA Learning English

Paleontologists, or experts in the study of fossils, do not know exactly when mammals developed and changed into warm-blooded creatures. A group of scientists tried to answer that question in a study recently published in Nature.

Mammals can produce their own body heat and control their body temperatures. This process is known as endothermy or warm-bloodedness. Scientists believe that it may be the reason why mammals likely … [+3941 chars]

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