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Replacing a defective gene with a normal gene.
Pro: You help people out.
Con:It might not work.

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Making an exact copy of an organism.
Pro:You can increase the population of species.
Con:The clone will have the same weaknesses as the original.

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Taking genes from one organism and putting them into another organism.
Pro:You can make better crops.
Con:The gene may be harmful.

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Medicines that stop the growth of or destroy a microorganism.
Pro:It can eradicate diseases.
Con: Diseases can become immune to certain antibiotics.

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A fuel made from living things.
Pro:Less carbon dioxide will be released into the atmosphere.
Con:It isn't very developed yet.