Answer:
A structure in the cell nucleus that contains DNA, histone protein, and other structural proteins.
Explanation:
If you have any questions feel free to ask in the comments - Mark
Also when you have the chance please mark me brainliest. 
 
        
                    
             
        
        
        
Answer:
I think it is quite an interesting idea to allow parents to 'design' their children before birth. Because some people have preferences and those preferences are taken very seriously. I wouldn't want to have a baby boy, I would want a baby girl. Although, this could be a waste of money and time because this might be one of the things that are better not to be fixed even if it isn't broken. But, this can also be good, if you desperately need a child with specific features, this can help. Even if I can't seem to find a reason where a child is supposed to have specific features.
Explanation:
 
        
             
        
        
        
A keystone species helps define an entire ecosystem. Without its keystone species, the ecosystem would be dramatically different or cease to exist altogether.
        
             
        
        
        
<span>Lipids
A lipid's function is to insulate the body and provide warmth in cold conditions. It can be concluded that a person with very little body fat gets very cold easily and a person with a lot of body fat gets very warm very quickly. </span>
        
             
        
        
        
The answer would be both A and B (: Which is C.