In this biology activity, students will first brainstorm and observe how humans use their hands. They will then conduct a short experiment to determine the importance of the opposable thumb to humans. This experiment involves students taping their thumb to render it useless while they proceed to do an everyday activity.
In his first book, "On the Origin of Species," Charles Darwin deliberately stayed away from discussing the evolution of humans. He knew it would be a controversial topic, and he just did not have enough data at the time to make his argument. However, about a decade later, Darwin published a book dealing with just that subject called "The Descent of Man.
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Pratt Museum, Homer, Ala. Invisible evidence Until recently, the bedrock evidence for evolution came from fossils. It was Georges Cuvier, back inwho first noticed that fossils found in higher layers of rock were more similar to modern creatures than those found in lower layers, or strata.
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Adaptations are traits or behaviors that organisms develop that make them better suited for their environment, or better able to survive in general. Adaptations often come about as a result of genetic mutations because when these mutations are beneficial they are passed on to the next generation. Your thumb is considered an adaptation because the development of the opposable thumb made your ancestors and therefore you better able to survive
M Matthen, Discussion. Elliott Sober maintains ,  that explanation by natural selection may show why all most, some humans have an opposable thumb, but cannot show why any particular human has one, Karen Neander [a], [b] argues that this is false because natural selection is 'cumulative'. It is argued here, on grounds independent of its cumulativity, that selection can explain the characteristics of individual organisms subsequent to the event.