Which of the following definitions of DNA is correct?
a. denatured ribonucleic acid
b. deoxynucleic acid
c. deoxyribonuclear acid
d. deoxyribonucleic acid

Which of the following actions does NOT occur when the diaphragm and external intercostals muscles contract?
a. The air enters the lungs.
b. The diaphragm moves in a downward direction.
c. The lungs' internal pressure rises.
d. The rib cage moves upward​