Evolutionist use the idea of "descent from a common ancestor" to explain why the forearm bones of a penguin, bat, and human are so similar. This explanation works for traits in your family, but can it be applied to the history of life on earth? The fact that we use such characteristics to classify organisms into groups does not mean that they are related to a common ancestor. The equally valid alternative is that all of these organisms were created by a common Designer who used the same design principle to accomplish similar functions. Although either explanation may appear equally valid, some instances make the case for a Creator clear.
When structures that appear to be similar to the one another developed under the control of genes that are not related, the common ancestor idea fails. Evolution would predict that the structures would be formed from a derived gene that has undergone modification through mutation and natural selection. Frogs and humans supposedly share a common ancestor that would account for the similarity of the limb structures. The problem is that when a frog's digits develop, they grow out from buds in the embryonic hand. In humans, the digits begin as a solid plate and then tissue is removed to form the digits. These entirely different mechanisms produce the same result, but they are not the result, but they are not the result of the same genes.
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