One Heartbeat Away such as when bacteria become resistant to antibiotics. This is also called adaptation or natural selection. Microevolution is scientific because it is observable and measurable. The other branch is macroevolution, which is the concept that successive small changes can, over time, gradually change one species to another. It involves not only minor variations but also the addition of completely new features and body types. Dr. J. P. Moreland summarizes it in this way: Microevolution is Macroevolution is the general theory that all life limited by the genetic arose from nonlife in some prebiotic soup (where chemical reactions plus some form of energy code. No features that gave rise to the first life), and all life evolved are not already present from the first life up to Homo Sapiens.19 in a creature’s DNA Macroevolution — the belief that can ever be produced the variations we can see taking place in microevolution (within a species) are by natural selection. supposedly continuous and limitless, so that one species will continue to change and eventually become a new species — is the heart of evolutionary theory. Macroevolution, however, has never been observed; therefore, it is not scientific. As I was searching for the truth about evolution, one of the most compelling facts I learned was that microevolution is limited by the genetic code. No features that are not already present in a creature’s DNA can ever be produced by natural selection. So, while there is variation within species, it is always within these limits. For example, there are many different types of dogs — from the Chihuahua to the Irish wolfhound, from the Mexican hairless to the Yorkshire terrier — yet they are all still dogs. In The Answers Book, Ken Ham describes this limitation of microevolution: Adaptation and natural selection are biological facts; amoeba-to-man evolution is not. Natural selection can only work on the genetic information
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