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Genetic engineering refers to the many different manipulative processes regarding genetic modification, such as deleting portions of DNA sequence or splicing together DNA from more than one individual. This process can be applied to any organism like viruses, animals, or humans. The use of technical equipment and scientific understanding to manipulate DNA overrides the natural process of evolution, making this scientific advancement controversial. This informative volume explores what genetic engineering consists of and provides a balanced overview about the controversies that surround the practice.