Final answer:
Testing the action of fire on human body parts is more valuable due to ethical reasons and the Kantian value of not treating humans as a means to an end. Ethical considerations have led to strict regulations on the use of animals in research.
Step-by-step explanation:
The reason that testing the action of fire on human body parts is more valuable than testing it on animal body parts is due to ethical reasons, among other factors. Ethical considerations have led to the development of strict regulations on the use of animals in research, including guidelines for their humane treatment. The Kantian value of not treating humans as a means to an end and the concept of natural rights have influenced these ethical standards. By prioritizing the well-being and rights of human subjects, society aims to ensure their protection and equal treatment.