One of the main reasons for using animals as subjects in a research study is that:

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Experimenters have better experimental control in animal studies. Animals are often bred for research purposes, which means they can be genetically uniform, and their environmental conditions can be carefully controlled. This allows for more precise experimentation and less variability in results compared to human studies. Additionally, researchers can manipulate various variables in animal studies that would be considered unethical or impossible to manipulate in human studies.

One of the Main Reasons for Using Animals as Subjects