Doyouwanttoknowhowandwhyafallleafchangescolor?Wefirstha...
问题详情：Doyouwanttoknowhowandwhyafallleafchangescolor?Wefirsthavetounderstandwhatleavesareandwhattheydo．Leavesaretheworld’sfoodfactories．PlantstakewaterfromthegroundthroughtheirrootsandtakeCO2fromtheai...