Scientific evidence supporting evolution continu...(overy in identifying the transition from...)

Date:1/7/2008

overy in identifying the transition from ocean-dwelling creatures to land animals. By understanding and employing the principles of evolution, the discoverers of this fossil focused their search on layers of the Earth that are approximately 375 million years old and in a region that would have been much warmer during that period. Evolution not only best explains the biodiversity on Earth, it also helps scientists predict what they are likely to discover in the future.

Over very long periods of time, the same processes that enable evolution to occur within species also can result in the appearance of new species. The formation of a new species generally takes place when one subgroup within a species mates for an extended period largely within that subgroup, often following geographical separation from other members of the species. If such reproductive isolation continues, members of the subgroup may no longer respond to courtship from members of the original population. Eventually, genetic changes become so substantial that members of different subgroups can no longer produce viable offspring. In this way, new species can continually "bud off" of existing species.

Despite the overwhelming evidence supporting evolution, opponents have repeatedly tried to introduce nonscientific views into public school science classes through the teaching of various forms of creationism or intelligent design. In 2005, a federal judge in Dover, Pennsylvania, concluded that the teaching of intelligent design is unconstitutional because it is based on religious conviction, not science (Kitzmiller et al. v. Dover Area School District). NAS and IOM strongly maintain that only scientifically based explanations and evidence for the diversity of life should be included in public school science courses. "Teaching creationist ideas in science class confuses students about what constitutes science and what does not," the committee stated.

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Contact: Maureen O'Leary news@nas.edu 202-334-2138 The National Academies Source:Eurekalert

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