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Throughout their mission there have always been spacecraft attached to the space station to get them - and the rest of those onboard - home if there was an emergency.。业内人士推荐谷歌作为进阶阅读
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Convergent evolution reflects, then, a widespread predictability of life’s design solutions. Similar biological forms and functions often emerge independently in unrelated lineages. For example, ice growth-inhibiting antifreeze proteins evolved independently in Arctic and Antarctic fishes. Although arising at opposite ends of the globe, these proteins converged at both the sequence and structural level: at both locations, they contain a repeating tripeptide motif of glycine–alanine (or proline)–threonine, with the last amino acid fused to a sugar. The severe constraint of survival in freezing seawater pushed these phylogenetically distant fishes to evolve similar molecular solutions.