A chromosome consists of a single, double-stranded DNA molecule. Chromatids are two molecules of double-stranded DNA joined together in the center by a centromere. Chromosomes have a thin ribbon-like structure. Chromatids have a thin and long fibrous structure.
 
        
             
        
        
        
Answer:
I don't think you'll understand this but...
Explanation:
Think of it as Evolving A Pokemon.
If that doesn't help go to google type in your question (Make sure its simple) And it should Give you a simple answer.
 
        
             
        
        
        
Answer:
Its C 
Explanation:
I got it right. Your welcome
 
        
             
        
        
        
Answer:
B
Explanation:
its literally a cell law .-.