Evolution is the idea that living things in our world have come into being through unguided naturalistic processes starting from a primeval mass of subatomic particles and radiation, over approximately 20 billion years. There are two aspects the of evolution theory: micro and macro-evolution.
Micro-evolution involves the process of natural-selection to cause population and species change through time. Natural selection states that those individuals which posses some advantage in the environment (such as being a faster runner) are more likely to leave more offspring, thereby increasing the probability of passing the advantage on to future generations.
Macro-evolution refers the progression to more complex forms of life through the mechanism of genetic mutation. Mutations are “mistakes” introduced into the genetic material used for reproduction, which can occur as a result of exposure to radiation. There are naturally occurring mutations, however they are very rare.
Thus, evolution is the process by which living things genetically mutate and then the natural environment determines which mutations to survive.
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