When fossil fuels are burned they can cause pollution which can cause global warming.
Answer: you didn't state the answers to choose from so i"ll just list common organic molicules: nucleic acids, proteins, carbohydrates and lipids.
Explanation:
Global warming is the answer
Athletics would be the easiest choice here
Sports are an active that takes up a lot of different organ systems. When running I use my muscular system and cardiovascular system the most. The cardiovascular system directly controls running because it helps prevent me from getting tired and worn out faster.
Hope this helps :)
