Biologists follow ‘fossilizable’ clues to pinpoint when mammal, bird and dinosaur ancestors became athletes
Many mammals and birds are remarkable athletes; mice work hard to dig burrows for protection and sparrows fight gravity with each flap of their wings. In order to have the energy to sustain vigorous exercise, the body’s tissues need a steady supply of oxygen, and red blood cells (RBCs) are the center of the oxygen […]
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