Nuclease to the ribosomes, pardon spelling im in a rush :)
Your answer would be "nucleus accumbens"!
I'm not sure how exactly you wanted this question to be answered. You're either talking about the symmetry where animals would have two legs or two arms for example and thus producing a pair of each muscle on both sides of the body, or you're refering to the development of agonistic and antaonistic muscles where each of them served a different purpose; either extending or contracting.
Answer:how much alligators are we talking about
Explanation:
