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Living cells contain thousands of different chemicals, some acidic, others basic. Many chemicals would react with others were it not for an intricate system of chemical barriers and buffers. If living things evolved, these barriers and buffers must also have evolved—but at just the right time to prevent harmful chemical reactions. How could such precise, almost miraculous, events have happened for each of millions of species (a)?

All living organisms are maintained by thousands of chemical pathways, each involving a long series of complex chemical reactions. For example, the clotting of blood, which involves 20–30 steps, is absolutely vital to healing a wound. However, clotting could be fatal, if it happened inside the body. Omitting one of the many steps, inserting an unwanted step, or altering the timing of a step would probably cause death. If one thing goes wrong, all the earlier marvelous steps that worked flawlessly were in vain. Evidently, these complex pathways were created as an intricate, highly integrated system (b).

a. This delicate chemical balance, upon which life depends, was explained to me by biologist Terrence R. Mondy.

b. Behe, pp. 77–97.

[From “In the Beginning” by Walt Brown ]

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