Each annual growth ring has

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(A) An annual growth ring is formed by the activity of the vascular cambium in temperate regions.It consists of two distinct zones: the early wood (sp

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An inner layer and an outer layer

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(A) An annual growth ring is formed by the activity of the vascular cambium in temperate regions.It consists of two distinct zones: the early wood (spring wood) and the late wood (autumn wood).The early wood is formed during the spring season and consists of wider,thin-walled xylem vessels.The late wood is formed during the autumn season and consists of narrower,thick-walled xylem vessels.Therefore,each annual ring is composed of an inner layer (early wood) and an outer layer (late wood).

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