Why does the enzyme pepsin (present in the stomach) denature in the intestine?
the enzyme denatures due to change in temperature as it enters the intestine.
the enzyme denatures due to the alkaline environment of the intestine.
the enzyme denatures due to lack of substrate molecules in the intestine.

Look at the following answer choices and determine which belongs in the both category. testable, can be disproven explains natural phenomena, has evidence to support it prediction, tentative, one or more scientists working together well established, many different scientists working independently, highly reliable

Tides that occur during the new and full moons

Which statement best describes the role of religion and culture in ancient medicine?