Comments by "Marc Jones" (@QT5656) on "The Skeletal System" video.

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  5. There are about 4200 official religions in the world. Many of them have origin stories that are wildly different from one another. Why believe one over any of the others? . When scientists use the word theory they don't mean guess. They mean a well-substantiated, well-supported, well-documented explanation for a range of observations. It's been tested again and again. . It doesn't really matter what I believe... but there is a vast amount of objective evidence for evolution and a common ancestry for all life on earth. Living animals share anatomical features with one another in a heriarchical pattern. Animals retain anatomical structures that are vestigal (inherited but not functional). There are numerous fossils that document further examples of animals with shared features (not present in living animals). The geographic distribution of animals also fits a pattern of common ancestry. Genetic material among living animals also shows a hierarchy of shared traits that supports common ancestry. Genetics also provides a mechanism for decent with modification without the need for any external being or group of beings. Evolution has even been documented over the past few decades (e.g. bedbug immune systems, bacteria resistance to drugs, HIV resistance, tomcod fish pollution resistance, cane toad leg length in Australia, bird beak size in many parts of the world where it has been carefully monitored, artiodactyl antler size, since the 1970s a new species of Podarcis wall lizard has evolved features that enable it to eat plants).
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