You Have Been Given a Piece of Tree Trunk, Sawed

You have been given a piece of tree trunk, sawed transversely, and are told to examine its structure.You don't see any growth rings and thus conclude that this tree grew in the tropics.You base this conclusion on the fact that only trees from temperate areas have the rings, which are formed when

A) heartwood cells alternate with sapwood cells.
B) resin is deposited in rings in the stem.
C) cork is deposited in rings in the stem.
D) phelloderm cell size varies with the season.
E) xylem cell size varies with the season.

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