What is a codon and why are they important?

One gene can influence trait(s). one trait can be determined by gene(s).

One important development during the 3rd trimester that will insulate the infant against changes in temperature is a. the deposition of fat under the skin b. the closing of the septum between c. the atria of the heart d. the beginnings of lung functioning e. the beginnings of light and sound sensing

To be or not to be that is da question