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growing and aging processes,rather than being regulated by a single gene. 28.Compared with adult ginkgo trees,cambium cell layers of ancient trees A.are thinner B.will disappear C.exist in the internal wood D.will change into bark 29.What will happen if a tree has a higher level of ABA? A.It will lose its ability to defend itself. B.It will produce more compounds. C.It will grow slowly. D.It will die soon. 30.How do trees defend themselves against pests? A.By reducing a lot of leaves.