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The best to be used is animals, as humans cannot be used. Plants cannot match up with the kinds of operations the doctors have to carry out. So, animals are the best to be used, although they are meant to live but not to be killed.
Indeed, in this case there are pros and cons, I feel that scientists also get a very difficult choice, but I am also surprised that they also have the right to live, thank you very much for stopping by, I hope you have a good day 🙏😊