I've been struggling with this for a few hours. If someone could provide an answer I could greatly appreciate it!

See explain

Explanation:

I gotchu. First, let's just remove A from the beaker and feed it to a rat. If he lives, the poison is A, if not it's still in one of the 3. Now, remove B and feed to a rat. If he dies, it's not B or A . . . so on until you have your answer.

Looking at the substances with a telescope or the smell if it smells bad it might be poison

Explanation:

c: warm water flows from the western tropical pacific toward south america. that should be the right answer! hope it .

yes, because even though a theory has a  lot of evidence to support it, it is not always true