Answer:
The Sun causes tides just like the Moon does, although they are somewhat smaller. When the earth, Moon, and Sun line up—which happens at times of full Moon or new Moon—the lunar and solar tides reinforce each other, leading to more extreme tides, called spring tides.
 
        
             
        
        
        
Answer:
I'm guessing proteins because hair is made out of keratin and keratin is a protein.
Explanation:
 
        
                    
             
        
        
        
20 quadrillion cubic meters
this is a very late answer but i'm sure that it's correct xD
        
             
        
        
        
Answer:
DNA replication needs to occur because existing cells divide to produce new cells. Each cell needs a full instruction manual to operate properly. So the DNA needs to be copied before cell division so that each new cell receives a full set of instructions!
 
        
             
        
        
        
Answer:
Urban heat
Explanation:
Urban heat is a terminology generally used to describe the higher temperature with in the cities as compared to the surrounding woods.
Jessica moved to industrial area which has large industries that continuously release heat and pollution in the environment. Due to this the environment in and around the industrial area is much warmer as compared to the outskirts of the cities (with mountains). 
Also the cities have offices & residential apartments, traffic and automobiles that continuously release heat and pollution thereby further enhancing the temperature of cities.