Depends on what the progress is (what field, what extent, etc.) and suffering (amount of being suffering, how much they suffer, etc.).
For example:
If you ask me, it right to test cosmetic products on animals? I believe not. Animals should not suffer merely for advances in the cosmetic industry.
But do I think it's acceptable to test an AIDS vaccination or -cure on animals? Absolutely. I don't like animal abuse (I even care about insects

!), but I put human lives above animals' lives any day.
You get my drift.
Quote:
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I explained to my teacher in a full essay that the question was impossible for me to answer truthfully.
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It'd be for me too, to be honest, simply because it's too broad. The best I can do is answer in the way I did above ("it depends on...").