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Content Provider | PBS LearningMedia |
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Copyright Year | 2001 |
Description | As this illustration from Evolution by Monroe W. Strickberger shows, the limbs of tetrapods all have the same pattern of bones. Darwin was one of the first to comment that it seems unlikely that this single skeletal structure could be the best one possible for each of the activities it is required to perform in different animals. The explanation for this common structure lies in a common heritage—a pattern of development laid down in the ancestor of all modern tetrapods and adapted over time, by different environmental pressures, to perform different functions. |
Sponsorship | National Science Foundation |
Language | English |
Publisher | PBS Learning Media |
Publisher Date | 2003-09-26 |
Access Restriction | Open |
Rights Holder | WGBH Educational Foundationand Clear Blue Sky Productions, Inc |
Subject Keyword | Science Life Science Diversity of Life Evolution Animals Evidence of Evolution Evolutionary Trees Mechanisms of Evolution Heritable Trait Distribution Homologous Structures, Genes, and Embryos Skeletal System Muscular System |
Content Type | Application |
Educational Role | Teacher Student |
Education Level | Class VI Class VII Class VIII |
Resource Type | Software Application |
Subject | Evolution |
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