Preclinical studies involves the testing of live animals. The correct option is D.
The use of biology to solve problems and the to create valuable goods is referred to as biotechnology. The most common method is genetic engineering, which allows scientists to manipulate an organism's DNA.
Clinical research, a part of biotechnology includes the following phases:
Testing live animals is a part of a preclinical trial that can involve certain vaccination, drug, medication, etc.
Thus, the correct option is D.
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