This digression is especially for those who are in the habit of recognizing the theory of evolution as a scientific truth and who strongly believe in the concept of "adaptation".

"Adaptation" is the noun form of the verb "adapt". "Adapt" implies a modification according to changing circumstances. As used by evolutionists, it means a "modification of an organism or its parts that makes it more fit for existence under the conditions of its environment". The theory of evolution claims that all life on earth is derived from a single organism (a single common ancestor) that itself came into being as a result of chance and the theory makes heavy use of this sense of the word "adaptation" to support its case. Evolutionists hold that living organisms change into new species by adapting to their environment. We have discussed the invalidity of this claim, that mechanisms of adaptation to natural conditions in living beings come into play only under certain circumstances. The theory of evolution with its concept of "adaptation" is really just a form of Lamarckism, a theory of organic evolution that holds that environmental changes cause structural changes in animals and plants that can be transmitted to offspring- a theory that has been soundly and rightly dismissed by scientific circles.

Yet even though it has no scientific basis, the idea of adaptation impresses most people and that is why we must address this point here before going on. From belief in the adaptability of life-forms, it is only a step to the idea that life could have developed on other planets as well as it did once on Earth. The possibility of little green creatures living on Pluto who might work up a slight sweat when the temperature soared to 238°C, who breathe helium instead of oxygen, and who drink sulfuric acid instead of water somehow tickles people's fancy, especially people whose fancies have been richly nourished by the products of Hollywood studios.

But these are only such stuff as dreams (and Hollywood movies) are made of however and evolutionists who are better informed about biology and biochemistry do not even attempt to defend such notions. They know quite well that life exists only if necessary conditions and elements are available. If they really believe in them at all, the partisans of the little green men (or other alien life-forms) are those who blindly adhere to the theory of evolution and are ignorant of even the basics of biology and biochemistry and who, in their ignorance, come up with preposterous scenarios.

So in understanding the error in the concept of adaptation, the first thing that we need to note is that life can only exist if certain essential conditions and elements are present. The only model of life that is based on scientific criteria is that of carbon-based life and scientists are in agreement that there is no other form of life to be found anywhere elsewhere in the universe.

Carbon is the sixth element in the periodic table. This atom is the basis of life on earth because all organic molecules (such as nucleic acids, amino acids, proteins, fats, and sugars) are formed by the combination of carbon with other elements in various ways. Carbon forms millions of different types of proteins by combining with hydrogen, oxygen, and nitrogen etc. No other elements can take the place of carbon. As we shall see in the sections ahead, no element but carbon has the ability to form the many different kinds of chemical bonds on which life depends. Consequently if life is going to exist on any planet anywhere in the universe it is going to have to be carbon-based.

There are a number of conditions that are absolutely essential in order for carbon-based life to exist. For example, carbon-based organic compounds (like proteins) can exist only within a certain range of temperatures. They start to dissociate over 120°C and are irrecoverably damaged if they are frozen below -20°C. But it is not only temperature that plays a vital role in determining the allowable limits of suitable conditions for carbon-based life to exist: so too do the type and amount of light, the strength of gravity, the composition of the atmosphere, and the strength of the magnetic field. Earth provides precisely such conditions as are needed to make life possible. If even one of conditions were to be changed, if average temperatures surpassed 120°C for example, there would be no life on Earth.

Therefore our little green creatures who might work up a slight sweat when the temperature soars to 238°C, who breathe helium instead of oxygen, and who drink sulfuric acid instead of water are not going to exist anywhere because carbon-based life-forms cannot survive under such conditions and carbon-based life-forms are the only kind there is. Life can only exist in an environment within limits and under conditions that are deliberately designed for life. That is true of life in general and of human beings in particular. Earth is such a deliberately-designed environment.