Answer:
They know that layering, or bedding, is the most obvious feature of sedimentary rocks.  This Law of Superposition is fundamental to the interpretation of Earth history, because at any one location it indicates the relative ages of rock layers and the fossils in them. Layered rocks form when particles settle from water or air. That is kinda easy :D
Explanation:
 
        
             
        
        
        
Explanation:
Observations allow us to collect data that we can connect back to the central problem. From this data we can start to form hypotheses (predictions on possible solutions or outcomes).
 
        
             
        
        
        
if it is just basic addition is would be 175
 
        
                    
             
        
        
        
I Think The answer is a I hope it helps My friend
        
             
        
        
        
Answer:
correct option is a.  more realistic
Explanation:
we know that marriage is legally relationship between a husband and a wife
and some for of marriage are 
1 Arranged marriage
2 Civil marriage
3 Common law marriage
4 Boston marriage
5 Berdache marriage
and in second marriage 
age and experience will be more 
so as they age, they have gained experience from their past life 
so we can say that in second marriages old couples tend to be more realistic
so correct option is a.  more realistic