Answer: B 
Explanation: Multiple different combinations of bases (A, G, C, T) can code for the same amino acid. This means that there are more possible combinations of the bases than there are amino acids. There are 20 amino acids and the four bases can have up to 64 different codon combinations.
        
             
        
        
        
Answer:
2 in 4
Explanation:
If a female cat with orange fur (XOXO) is crossed with a male cat with black fur (XoY) then:
P: XOXO  x  XoY
F1: XOXo  XOY  XOXo  XOY
This means that half of the offspring will be females with tortoiseshell color  (XOXo) and other half  of the offspring will be males with orange fur (XOY).
 
        
             
        
        
        
A film of water covers the gametophyte
        
                    
             
        
        
        
Nerves are cells that can detect any type of pressure, movement, or anything of that nature. If we didn't have nerves, we couldn't feel pain. If the nerves in a foot are damaged, you wouldn't feel the pain of it being burned.