Why should there be that kind of similarity? Why should a person’s arm have the same kind of bone pattern as the leg of a dog and the wing of a bat? There are two basic ideas. Biologists use the term “homology” for such similarities in basic structure. As it turns out, there are many other living things that have forelimbs with a similar pattern: the foreleg of a horse or dog, the wing of a bat, and the flipper of a penguin, for example, as shown in Figure 6. There’s one bone attached to the body, two bones in the forearm, a little group of wrist bones, and bones that extend out into the fingers.
If God made people as people, why are we full of “animal parts”? Look at your arm for a moment and try to picture the bones inside.
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