Jerry is a member of a research lab where they study the effects of lead poisoning on rats. he sees the benefits of research on animals but also seeks to conduct his research in the most humane way possible. jerry most likely is a

animal welfare activists

Explanation:

Animal welfare activists is a professional who fights against the authorities, laws, research institution to protect the rights of animals.

Here, although Jerry is working on the effect of lead on rats but wanted to be done in humane way hence, he can be considered as animal welfare activitist.

are there any options?

answer; ///attempts to change more than once behavior at the same time;