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Answer:
Human society emerged over 6 million years of hominid evolution. During this time group size steadily increased, and to maintain group cohesion human beings gradually evolved a well-developed social intelligence based on the differentiation and refinement of emotions.Five types of evidence for evolution are discussed in this section: ancient organism remains, fossil layers, similarities among organisms alive today, similarities in DNA, and similarities of embryos.The next step will be to actually change people's genes. That could conceivably be done in two ways: by changing genes in the relevant organ only (gene therapy) or by altering the entire genome of an individual (what is known as germ-line therapy).
