What if a mutation caused a change in the code so the message read UCA instead of UCC? How would this affect the protein produced?

The protein produced will not be affected.

Explanation:

In the genetic code, UCA code for the amino acid, Serine. Also, UCC code for serine. Thus, since UCA and UCC code for the same amino acid (serine), the mutation will not affect the protein at all.

i think it would be b. tissue because an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.