Could life have survived deep below the surface of ancient earth

In my opinion, I don't thin so. That is because we would have to adapt to the ancient earth & there would would be things that we have to do but can't because we don't know what life would be like.

hope this helps, sory if not tho

oxygen +1 most likely

your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.