Answer:
B. Thymine
Explanation:
The thymine pairs with adenine. Thus, option (B) is the correct answer. 
 
        
             
        
        
        
Answer: they are sex cells
Explanation: 
- organisms have two types of cells: somatic(body) cells and germ(sex) cells. 
- Somatic cells are basically all cells <em>except</em> for germ cells. 
- This is a very general summary of the two.
 
        
             
        
        
        
Answer:
1/4
Explanation:
The reason that the answer is 1/4 is because the young man, his grandfather, his father, and his mother equal 4 people. The young man is 1 person. 1 person/4 people = 1/4.