Step one: Travel approximately 18 inches up the underside of the branch you are removing. Cut up about halfway through the branch. 
Step two: Move to the top side of the branch. Choose a location an inch further out from your first cut. Carefully cut down until the branch breaks free.
Step three: Find the branch collar on your trunk. This is stem tissue around the base of the branch. . Make a complete cut with a 45-degree angle kicking out from the base of the tree.
(SOURCE Chris Lambton) Add your vocabulary words in along the way if you decide to use my answer. 
 
        
             
        
        
        
It should be natural selection since there is no external influence implied. (like environment or genetic mutations.)
        
             
        
        
        
You get 2 ATP molecules from anaerobic metabolism
        
             
        
        
        
Answer:
B
Explanation:
During cellular respiration in most animals and plants, oxygen reacts with carbon containing molecules (sugars) to provide energy to cells of the organism. the flow of energy in organisms.
 
        
             
        
        
        
Answer:
Multicellular organisms: Both the plant and the ox are made up of more than one cell.
Both the ox and the plant need to breath somehow  (use air).
Explanation: