Really? A. lol (no trees = unstable environment)
Answer:
Humans have breached this cycle by digging up fossil fuels and burning them, leading to carbon dioxide building up in the atmosphere faster than natural systems can soak it up. This has led to a net increase in greenhouse gases in the atmosphere, causing the planet to heat up.
Explanation:
Answer: It regulates the electrical charges moving in and out of the cells of the body.
Explanation: