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Illustration of an embolus floating in an artery. The embolus will become lodged in a blood vessel t
Darwin observed that tortoises on islands that are arid tend to have saddle-shaped shells, allowing
Apidium may be ancestral to all later higher primates and is reconstructed as looking like a small-b
Ardipithecus kadabba has large canine teeth that are only slightly smaller than those of living apes
Reduced mobility in late adulthood often results in more limited activities and smaller social ...