Which of the following best explains the difference between dominant and recessive traits? A. Dominant traits always appear, even when combined with a recessive allele. B. Dominant traits only appear when combined with a recessive allele.
C. Recessive traits always appear, even when combined with a recessive allele.
D. Recessive traits only appear when both alleles are dominant.

How does the closing of the ductus arteriosus and ductus venosus alter circulation in an infant? a. increases blood flow to the pulmonary artery and increases blood flow to the umbilical vein b. increases blood flow to the pulmonary artery and reduces blood flow to the umbilical vein c. reduces blood flow to the pulmonary vein and increases blood flow to the umbilical artery d. reduces blood flow to the pulmonary vein and reduces blood flow to the umbilical artery