Answer:
D. Biotechnology
Explanation:
Biotechnology is the use of living organisms in technological applications. It involves using technological practices and principles in manipulating living organisms in order to produce beneficial products.
One aspect of biotechnology is genetic engineering or genetic modification which entails changing the genetic content of an organism to suit desirable effects. Hence, researchers trying to replace damaged genes that cause inherited diseases or to genetically engineer bacteria are studying BIOTECHNOLOGY.
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