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最新推荐文章于 2020-12-15 12:45:37 发布

ujn20161222

最新推荐文章于 2020-12-15 12:45:37 发布

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本文链接：https://blog.youkuaiyun.com/ujn20161222/article/details/87983108

本文探讨了古代淡水绿藻如何克服极端温度和干旱期，通过化学变化和更厚的外层等适应性特征，成功地从水生环境过渡到陆地生活。这些适应性特征不仅帮助它们在恶劣环境中生存下来，也为后来的植物登陆奠定了基础。

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From a plant's evolutionary viewpoint, however, it was also a land of opportunity, free of competitors and predators and full of carbon dioxide and sunlight (the raw materials for photosynthesis, which are present in far higher concentrations in air than in water). So once natural selection had shaped the adaptations that helped plants overcome the obstacles to terrestrial living, plants prospered and diversified.

A. It was exposed to high levels of solar radiation.

D. It lacked the presence of any organisms.

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问题

The environmental conditions of freshwater habitats, unlike those of ocean habitats, are highly variable. Water temperature can fluctuate seasonally or even daily, and changing levels of rainfall can lead to fluctuations in the concentration of chemicals in the water or even to periods in which the aquatic habitat dries up.

具体的

Ancient freshwater green algae must have evolved features that enabled them to withstand extremes of temperature and periods of dryness. Scientists believe that chemical changes and a thicker exterior, among other things, may have helped ancient algae overcome the conditions in their environment. These adaptations served their descendants well as they invaded land.