Speech Air

Air Speech Did you know that trees are the Main Source of oxygen for humans Unless someone invents an individual supply of oxygen in the future. Humans can only breathe because there is oxygen in the air. saving our trees is important to all of us because without them we will die. In my speech I am going to talk about why we need oxygen to breathe and how oxygen is made.? Air helps us breathe because of the oxygen that is in the air How oxygen is made oxygen is made by trees and that's why we can’t chop down trees If we lose all the forests in the World then we won't be able to breathe My conclusion for air for the first sentence: how do we know that trees are the Main source