I believe the correct answer would be D, turning up the heat in cold water. Because you are then paying more money to turn the heat up instead of Doing the other ideas.
Answer:
the optimal pH for enzyme function is 6 but it can function well between a pH range of 2 to 7 which is the pH in small intestine. At highly alkaline pH the enzyme will denature.
Explanation:
A group of organs would be an organ system so perhaps B
Bubbles can be an analogy. It is like a cell membrane. Or maybe a mall, or airport, a fenced yard, a school, or a screen door. Good luck with your project. Brainliest is greatly appreciated.