Biology-Ch.22 Response

Biology-Ch.22 Response - islands of the Galapagos. The...

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Biology Ch.22 Response Ch 22: Write a paragraph briefly describing the kinds of evidence for evolution. The skeletal structures of organisms that existed a long time ago can be determined by looking at fossils found in sedimentary rock. These fossils are found specifically in stratas of sedimentary rock which represent different time scales. Another way to date fossils is through radioactive dating. Homologous structures are bone structures which support the theory of common ancestors. By comparing the bones of fossils and current organisms, it is determined that two or more different species evolved from one common ancestor. Biogeography describes the distribution of similar organisms. These organisms adapt to their specific geographic location based on the food and other factors specific to that location. An example of this is the Galapagos finches which are found on the different
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Unformatted text preview: islands of the Galapagos. The finches exhibit different traits but all are thought to have a common ancestor which branched off into different species based on the different geographies of the islands. Vestigial organs are structures anatomical organs are homologous structures of limited use to the organisms. Embryology is further evidence for evolution because some structures appear in the embryo stage of an organism which does not carry through to adulthood but which may also be found in the embryo stage of another species. An example of this is the human embryo and the fish embryo; human embryos have gill slits similar to those exhibited in fish. This is proof of how similar humans and fish really are evolutionarily speaking....
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