Mutations..are the basis of evolution states the world book encyclopedia. However, it is not just any kind of mutation that evolution requires. Robert Jastrow pointed the slow accumulation of favourable mutations. The environment selects those few mutations that enhance survival, resulting in a series of small changes of life form into another, the origin of a new species. Its is generally accepted that the mutations supposedly involved in evolution are small accidental changes that accumulate over a period of time. Now you said, "mutation that allowed an animal to better survive in its environement". This is totally false. Beneficial mutations are a basis of evolution what proportion of them are beneficial? The is overwhelming agreement on this point among evolutionist. For example Carl Segan declares "most of them are harmful or lethal". It was found in an experiments that, for every succesful or useful mutation, there are many thousands which are harmful". For example when mutated insects were placed in competition with mormal ones the results were always the same. After a greater or lesser number of generations the mutants are eliminated. They could not compete because they were not improved but were degenerate and at a disadvantage. In the long run to be sure mutations make evolution move onward and upward. But do they? Would any process that resulted in the harm more than 999 times out of 1000 be beneficial? If you wanted to build a house,would you hire a builder who, for every correct piece of work, turned out thousands that were defective? And mutation doesnt change living organisms into a completely different organism. The world book of encyclopedia gives an example of what might happen to a beneficial mutation. A plant in a dry area might have a mutant gene that causes it to grow larger and stronger roots. The plant would have a better chance of survival because it roots could absorb more water l. But has anything new appeared? No, its still the same plant. Mutations could change the colour, texture of one's hair but the hair will always remain hair
