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Showing posts with label Darwin. Show all posts
Showing posts with label Darwin. Show all posts

Thursday, July 24, 2008

Intelligent Design - Part II


Chapter Two
History of Intelligent Design Theory

For the first 4,000 years of human history, scientists accepted the design theory. Aristotle, Plato, Aquinas, and Newton all believed nature shows design (Meyer 2000).

Theologians Thomas Aquinas (1225-1274) and William Paley (1743-1805) argued for the existence of God based on the presence of design in nature. This philosophy is referred to as the teleological argument, natural theology, or theological design. The word “teleological” is derived from the Greek word “telos,” which means end or purpose (Richards 2004).

In 1802, William Paley published a book titled Natural Theology. In his book, Paley uses a watch to illustrate the nature of design. The parts of the watch form a complex mechanism that cannot be explained by chance. Paley argues that objects in nature exhibit the same complexity as the watch. He concludes, therefore, that nature reflects design as well (Dembski 2003a).

According to William Dembski (2003a), mathematician and philosopher, early design arguments did not rely solely on science but involved the metaphysical (supernatural) realm as well. Today’s intelligent design theorists focus on understanding how science – not the metaphysical – explains design. Intelligent design theorists look especially to molecular biology for evidence of design and rely on the latest scientific information to support their theory.

In 1859, the design argument took a backseat to Charles Darwin’s theory of evolution.

Charles Darwin

The argument for design declined in popularity when, in 1859, Charles Darwin offered an alternative explanation for the origin of life called the theory of evolution. In his book, The Origin of Species, Darwin argued that the healthiest members of a species pass down their genes to the next generations. The unfit members of a species die, and the most fit continue to reproduce. This process is called natural selection or “survival of the fittest.” Darwin argued that over time, this process produced new species (Harris and Calvert 2003).

Today, evolutionists believe an “updated” version of natural selection. They teach that random genetic mutations (errors in DNA) cause the differences seen in species. Mutations can be helpful or harmful to a species. Modern-day evolutionists claim that natural selection chooses the helpful mutations that give a species the greatest chance of survival. These traits are then passed down from generation to generation (Pittman 2003). However, mutations do not occur often enough to “account for all the hundreds of thousands of fundamentally different genes” that exist (Mondore and Mondore 2002, p 3).

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Take Note
Harris and Calvert (2003) point out that the term “natural selection” is inconsistent. “Selection” implies that a choice or decision is made. However, natural selection says that events occur randomly, without purpose or intelligence. Therefore, choice and decision are excluded from the process.
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Chemical Evolution – a Challenge to Design

Most biologists rejected intelligent design during the late 19th century. During this time, scientists sought to confirm Darwin’s theory of evolution through scientific experiments (Meyer 2000). In the 1870s and 1880s, scientists believed life was made out of a material called protoplasm that they could easily create by combining chemicals such as carbon dioxide, oxygen, and nitrogen.

Scientists Haeckel and T.H. Huxley believed a two-step process of combining and recombining chemicals created the first cell. Just as combining sodium and chloride produces salt, Haeckel and Huxley believed that combining chemicals could produce a cell. This is referred to as chemical evolution (Meyer 2000).

In 1952, a graduate student named Stanley Miller tested the chemical evolution theory. He created a small amount of amino acids (the building blocks of protein) by combining methane, ammonia, water vapor, and hydrogen – the gaseous mixture Miller believed represented the early atmosphere on Earth (Meyer 2000; Strobel 2004).

Years following Miller’s experiment, scientists determined that Miller’s assumptions of what the early Earth’s atmosphere contained was inaccurate. To date, there is no evidence that the atmosphere of the early Earth consisted of methane and ammonia (Meyer 2000).

Yet, even if Miller’s experiment were re-created using the correct atmospheric conditions, the results would yield formaldehyde and cyanide. Scientist Jonathan Wells makes this observation: “Now, it’s true that a good organic chemist can turn formaldehyde and cyanide into biological molecules” (Strobel 2004, p 38). However, Wells points out that far from representing the origin of life, these molecules represent embalming fluid – a fluid used to preserve bodies that are no longer alive.

What Miller’s experiment did demonstrate is the need for intelligent intervention. Meyer (2000) explains that in the type of experiment Miller performed, the experimenter must get involved to prevent cross-reactions that would cause the amino acids to break down. Experimenters do this by removing certain chemicals that could produce undesirable affects. Meyers gives this example: A realistic atmosphere includes both short and long wavelength light. However, experimenters often use only short wave length light because long wavelength light causes amino acids to break down.

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Take Note
Miller’s experiment is still included in many textbooks in spite of its inaccuracies (Strobel 2004).
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Over the years, advances in the fields of molecular biology, biochemistry, physics, and astronomy have made it difficult for scientists to dismiss intelligent design (Meyer 2000). As a result, intelligent design has increased in popularity since the end of the 20th century (Behe 1999).