I'm not the greatest at grammar, but I think the very first one is incorrect. It should just be a comma, then the second just a comma as well, but the last one is correct. (I have no idea, I am sorry if you get it wrong.)
“They tied me up, then, plumb / amidships, back to the mast, lashed to the mast, / and took themselves again to rowing.”
The one you cursor is already on.
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You could put up posters, volunteer at animal hospitals, or maybe even research them to know more about their needs.
Answer:
a- Animals do not react positively to human products being tested on them as they are used to determine faults and any harm.
b- the human products often contain harmful chemicals in testing stages on animals which can lead to genetic disorders
c- because there is no definitive answer which is why they're testing to find our what is going to harm the humans