The Siluria2 - The Silurian Perhaps the most significant...

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The Silurian Perhaps the most significant advance of life during the Silurian was the colonization of the land, first by plants and insects, and later (during the devonian) by certain "fish" and their offshoots, the amphibians. The Silurian land was populated by early land plants as well as a variety of insects. Both plants and animals had a number of challenges when they moved from the water to land. 1. Drying out. Once removed from water and exposed to air, organisms must deal with the need to conserve water. A number of approaches have developed, such as the development of waterproof skin (in animals), living in very moist environments (amphibians, bryophytes), and production of a waterproof surface (the cuticle in plants, cork layers and bark in woody trees). 2. Gas exchange. Organisms that live in water are often able to exchange carbon dioxide and oxygen gases through their surfaces. These exchange surfaces are moist, thin layers across which diffusion can occur. Organismal response to the
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The Siluria2 - The Silurian Perhaps the most significant...

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