For the oxygen created and for the ridding of CO2 that is "used up" in the process
Block any entry points
Eliminate sources of food, water, or shelter
Answer:
I believe it would be the 2nd choice
Explanation:
Abseiling, also known as rappelling from French rappeler, 'to recall' or 'to pull through', is a controlled descent off a vertical drop, such as a rock face, using a rope
