How did land plants once evolve from ocean plant spieces?
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include examples of specific plants and requirements for plants to live on land. Thanks
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Answer:
Land plants first evolved around 470 million years ago. Their direct ancestors were chlorophyte algae, whose habitat was shallow coastal seawater areas which periodically dried out with tidal movement. The most important requirement for plants to live on land is the ability to survive the drying effects of air. The earliest plants, closely related to modern mosses and liverworts, could only live in wet or damp places because they had no vascular system to draw water through their tissues. Metzeriothallus sharona is the oldest liverwort fossil found so far. http://en.wikipedia.org/wiki/Metzgeriothallus For plants to evolve further, it was necessary to develop a way of drawing water through their tissues (a vascular system). The earliest known vascular plants (plants with water-conducting lignin in their tissues) include the Baragwanathia genus. Though these are now extinct, their closely related escendants, club-mosses, survive today. Examples of particular species include Lycopodiella inundata and Lycopodiella cernua. http://en.wikipedia.org/wiki/Lignin http://www.arkive.org/marsh-clubmoss/lycopodiella-inundata/ http://wildlifeofhawaii.com/flowers/1136/lycopodiella-cernua-staghorn-clubmoss/
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