But biological evolution has its limitations. First of all, it is exceedingly slow. It took millions of years for our prehistoric ancestors to develop full upright posture and true bipedal locomotion, and well over a million years for the hominid brain to reach its present immense size. In the process of biological evolution, new and more beneficial genetic information can be transmitted only from a parent to its biological offspring. This means that many generations are required before a beneficial gene can spread throughout a breeding population. And before it can succeed, the children,
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