SCILIVSY 12 Chapter 5: SLS12- Chapter 5

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Document Summary

Species of different genera and classes have not changed at the same rate, or in the same degree. The productions of the land seem to change at a quicker rate than those of the sea. Variations do not occur by chance, they are somehow related to the conditions of life that exist in species" geographical environments. Variations will develop in animals and plants that will allow them to better survive in an environment. These variations will be naturally selected over less beneficial variations, prompting the advantageous variations to reappear in subsequent generations. Believes that the use and disuse of particular organs play a role. Gives numerous examples of animals with unused organs, such as ground living birds, insects with wings that are useless for flight, underground-living rodents with eyes that have been covered by skin or fur, and cave-living animals that are blind. Lack of use may cause organs to be modified.

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