The train traveled 100km (50x2) down and then 375km (75x5) up. So the train is 275km (375-100) up from where it started. 
        
             
        
        
        
Answer:
They provide energy, protection and insulation for the organs in the body. They're also very important in the cell membranes.
Explanation:
 
        
                    
             
        
        
        
Answer:
strengths are it's simple and easily understood and limitations is that it cant maintain simplicity if it's more descriptive 
 
        
                    
             
        
        
        
As we can see in the pedigree, both of the parents do not possess the trait, but one of the four offspring (marked with red) is expressing the trait.
Since the trait is recessive, the only way that is possible that the parents who do not possess the trait to have the offspring with the trait is that the parents are heterozygous for the trait. Meaning that both of the parents have one dominant allele and one recessive allele.