This has shown up three times but it’s B
Answer:
Temperatures in the atmosphere decrease with height at an average rate of 6.5°C/km. Because the troposphere experiences its warmest temperatures closer to Earth's surface, there is great vertical movement of heat and water vapour, causing turbulence.
If you are talking about snakes eventually the new skin will be just like the old one so the snake using a rough surface the snake will repeatedly rub against until the old skin peels of revealing the new one underneath
The answer to this question is, A. Physical!