Explanation: okay so cells have this mechanism to kill themselves if a bad mutation happens but when that breaks and the cell can longer do that it is considered a cancer cell the cell will continue to mutated and multiply if mutated enough it will be able to hide itself with regular cells, from the immune system after a long time it will get veins to give all the nutrition to the cancer cells making it grow more if lucky it will multiply and mutated but this mutations makes it think its a regular cell creating a cancer tumor
now cancer is beating cancer. eventually it will take over but you will have god cancer
One way is that it add water to the atmosphere. Another way is that the trees and leafs provides the oxygen
B is the answer you are looking for :) Good luck!
