Scientists have learned for decades through their work on animals.
God bless Barbaro for his contribution to the good of all humans and animals!!
"Scientists have learned for decades through their work on animals."
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And to some extent with people. For example, I have cats, one of whom is elderly and manifesting some of the same diseases common to elderly humans. She is being treated with medications prescribed for people. Unless some PETA person got in an uproar, that medicine may have been derived from research on animals. The success in humans has in turn helped to benefit animals with similar diseases.
The relationship between man and animals has been mutually beneficial...well, except for some idiots who have used and abused, but that's a whole other story.