Answer:
box 4, because it has more atoms in the same amount of space 
 
        
             
        
        
        
Pollution is always a good way to go but you don't have to do air pollution you can do water pollution or both air and water pollution.
 
        
             
        
        
        
Definitions; 
1.
2.
3. Ligament
4.
5.
6.
7. Joint
8. 
9. Spongy Bone
10. Skeletal System
11.
12. Bone Marrow
        
                    
             
        
        
        
Answer:
Usually the Y chromosome. It is recessive because if one Y chromosone is mutated with red-green colorblindness and the X is not, the child will have colorblindness. But, if one X chromosome has the mutation and the other X does not, they will cancel out, meaning the child will not have colorblindness.
 
        
             
        
        
        
Answer: increase in genetic variation 
Explanation: