the plants developed due to a lack of water and a need to preserve as much water as possible
Mainly because it was extremely hot at the beginning of Earth's time.
The answer is D. That is what physics textbooks say.
Answer:
(d) None of the above
Explanation:
The pH of your stomach must be highly acidic, because the optimum pH for pepsin, the chief stomach enzyme, is 1.5.
(a) and (b) are wrong, because both conditions are basic.
(c) is wrong, because pH 7 is neutral.
