B 
Transpiration is ultimately the main driver of water movement in xylem. The cohesion-tension model works like this: Transpiration (evaporation) occurs because stomata are open to allow gas exchange for photosynthesis.
        
             
        
        
        
The answer is environmental stress
        
             
        
        
        
Answer:4,500
Explanation:6mm times 750 equals 4,500
 
        
             
        
        
        
Oxygen,carbon dioxide,ATP, & water
        
             
        
        
        
Answer:
Water, carbon dioxide, and oxygen are among the few simple molecules that can cross the cell membrane by diffusion (or a type of diffusion known as osmosis ). Diffusion is one principle method of movement of substances within cells, as well as the method for essential small molecules to cross the cell membrane.
Explanation: