What does it mean that apples don’t “come true” from seeds? (9) What is grafting, and when was it first practiced? (12) Explain why “if not for grafting, every apple in the world would be its own distinct variety.” (10) How many new apple varieties could come from each tree (11)? What would have happened if Americans only planted grafted trees? (42) What plants come true from seed? Do animals? Do people?

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