What vitamin do humans and guinea pigs not manufacture?

AMHD does not do homework - this is a very simple subject to search and locate.

I notice you have two biology questions. Have you asked your teacher for assistance?

Pretty simple if you think about it...

Well, I have been to the store and I see that humans make all kinds of vitamins. Just walk through any pharmacy and look at the shelves... humans make every vitamin you could possibly need and some that you don't have a need for.

Now Guinea Pigs on the other hand... I know they can't make any vitamins at all. They don't know how to run machines or mix ingredients... heck, they don't even have opposable thumbs! That movie with the talking Guinea Pigs that were spies and used those little gadgets, well, sorry to say that movie just wasn't real. That was all done with CGI and wasn't real at all. So no, Guinea Pigs can't make any vitamins.

I hope I was able to help you out.