Well the surface area changes because there are two dimensional which are flat    and 3-d which would be geometric. It is important because if you have to take volume or area you would know why there 2-d and 3-d are important.
hope that helped
        
             
        
        
        
The answer is D, because HIV is not AIDS, but can lead to it. HIV is passed through bodily fluids, not one-on-one contact. HIV targets Helper T cells, and it can be up to years for a significant amount of Helper T cell count is lost, becoming AIDS, a life threatening disease. 
        
                    
             
        
        
        
<span>The answer is D. Example
of such a relationship is that of a tick and a cow. The tick is the
ectoparasite while the cow is the host.
The tick benefits by sucking blood from the cow while the cow is disadvantaged since it is losing some of its
blood and also the tick is a vector of disease</span>
        
                    
             
        
        
        
your answer is condensation because that is the process in the water cycle in which water is evaporated or changed into clouds.
 
        
             
        
        
        
Answer:
Underneath both the soil and the ocean, Earth's outer layer is made of sand and water. Underneath both the soil and the ocean, Earth's outer layer is made of hard, solid rock.