I’m guessing San francisco was cooler and st. louis was warmer? 
 
        
                    
             
        
        
        
Answer: a. Increasing the surface area for diffusion 
Explanation:
When the air is inhaled through the nostrils, the air containing the oxygen the air diffuses inside the alveoli. The alveoli are the tiny sacs where air enters and exchange of gases takes place. From the alveoli the oxygen enters into the blood stream. The oxygen is utilized by the cells for respiration. The increase in network and number of the alveoli will increase the surface area for the diffusion of oxygen and hence, will speed up the respiration process. 
 
        
             
        
        
        
Answer:
atp to adp
Explanation:
i actully passed this test in science
 
        
             
        
        
        
I’m pretty sure the answer is 4. 
Evaporites are rocks formed by the evaporation of water. They are sedimentary rocks. Common examples of evaporites include gypsum, anhydrite, and halite (common salt.) I hope this helps! :)