[jasonszhao]

The article mentions planaria, a type of flatworm that can regenerate from a small piece of tissue. Many experiments with these animals involve cutting them up various ways.[0]

I agree that animal testing is integral to modern medicine, but I also agree with the parent that unnecessarily inflicting pain on even lower animals reflects badly on humanity. How many of these experiments are actually necessary? Do research institutions make the researcher convince them that the suffering is really necessary for medicine, rather than merely to satisfy some curiosity?

[0]: https://en.wikipedia.org/wiki/Planarian#Regeneration As a side note, the next section of the Wikipedia article, describes even more grotesque experiments.