Adaptation: A physical trait or behavior due to inherited characteristics that gives an organism the ability to survive in a given environment.
Evolutionist often look at a characteristic of an organism and assume that it was produced through a series of changes and call it an adaptation to a given environment. To an evolutionist, legs on tetrapods are an adaptation that arose as a fish's fins became adapted to crawling in a shallow stream, providing some form of advantage. The fins with more bones were better adapted to a life partially lived on the land. Fins that developed bones attached to a pectoral girdle gave an advantage to those individuals that wandered onto land to find food or avoid predators. The problems with this scenario are in the amount of time such a change would require and the lack of a mechanism to cause the change.
Evolutionary biologists assume, based on geologic interpretation, that there have been billions of years for this process to occur. But if long ages did not exist, the hypothesis can't be true.
The other requirement, a mechanism for change, is also assumed to exist-even though it has never been observed. Natural selection tends to delete information from the population. If natural selection is the mechanism that explains the successive adaptation in the fish fin example, it must provide new genetic information. To produce the new bones in the fins requires an orchestration of biologic processes.
The bones don't just have to be present; they must develop at the right time in the embryo, have their shape and size predetermined by the DNA sequence, be attached to the correct tendons, ligaments and blood vessels, attach to the bones of the pectoral girdle and so on. The amount of information required for this seemingly transformation can't be provided by a process that generally deletes information from the genome.
https://www.youtube.com/watch?v=tB3_xGNe9Kg
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