Sometimes , Darwinian lifelike survival stumbles upon the same solution more than once , in a process cognize as convergent evolution . Here are our favourite examples of organic evolution making the same brute , or same physical trait , twice .
In evolution , mutation is random , but excerpt is most sure as shooting not . Every adaptive new trait acquired by a specie was likely attach to by countless failed experiments . The evaluator , as it were , in deciding which mutation are good or not is brutally childlike : ongoing survival .
For organisms caught in a Darwinian musical mode of existence — which is all of them — the blank of all possible beneficial mutations is sufficiently pocket-sized , a space rule by physics , biologic constraint , and environmental pressures . It sometimes happens that two unrelated mintage , separated by meter and space , will feel themselves living in the same ecologic recess or facing similar evolutionary job . When this happens , development will sink into its limited grab - bag of result — as you’re able to patently see in these spectacular deterrent example .

Left: Artist’s impression of extinct ichthyosaurs. Right: A modern dolphin.Image: Andrey Atuchin/ טל שמע (Wikimedia Commons)
This story was in the first place publish on June 11 , 2020 .
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