5.Even though humans are unable to digest cellulose, it is important in our diet because a. we need the chlorophyll contained in plant cells.
b. it allows the stomach to absorb vitamins.
c. it is needed to synthesize vitamin B.
d. it protects the walls of the intestines from mechanical damage.
e. it adds volume to the wastes in our large intestine and ensures that we eliminate toxic
materials more frequently.

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