I think it 700 million years because I took the same question and that’s what I put.
I think the correct answer from the choices listed above is the second option. The enzyme pepsin that is present in the stomach denature in the intestine due to the alkaline environment of the intestine. This is because pepsin has an optimum pH that is very low which is ideal for the acidic conditions of the stomach.
The answer is A because if you want a reliable source of scientific information you should go to an actual scientist at a scientific conference.
The answer is groundwater.
