Answer: the first one
Explanation: the rest are very wasteful :)
When fossil fuels are burned they can cause pollution which can cause global warming.
Answer:
I shall oppose to this notion
personally I think that since there no oxygen on mars the extraterrestrial creatures or alien plants may have alternative means of survival even if there ain't water
Answer:cellular respiration is a process by which cells use oxygen to produce energy from food.
This happens in the mitochondria