Can produce fertile offspring 
        
             
        
        
        
Well, ask yourself, "Do I try hard enough?" "Was it the best I could do?" And well if the answer is yes, then you have nothing to stress out about too much. Maybe talk to your teacher and ask for extra credit. Get tutoring. Talk to a guidance counselor. If none of that helps, well then you're just not the best at the subject, but just try your best. In the future, you won't even remember about all those grades! Coming from a 6th grader, the beginning of the year was super hard. I'm not the best at math, but I'm very good at Language Arts. Everyone has their own weaknesses and strengths. Don't worry about it.
        
             
        
        
        
Answer: anaphase- the stage of meiotic or mitotic cell division in which the chromosomes move away from one another to opposite poles of the spindle 
Example: daughter nuclei 
Explanation:
 
        
             
        
        
        
Answer:
Down syndrome, Turner syndrome and Klinefelter syndrome.
Explanation:
Down syndrome, Turner syndrome and Klinefelter syndrome are the genetic disorders which are found in chromosome. Down syndrome is a common genetic disorder that occurs when a person has three copies of 21st chromosome. It is also called  trisomy 21. Due to this disorder, delays occur in physical and mental developmental and disabilities of human body parts.