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?