Wood is composed of

A) cork.
B) cork cambium.
C) secondary phloem.
D) secondary xylem.
E) sieve-tube members.

Secondary Xylem

The part of the plant vascular system that transports water and nutrients from the roots to the shoots and leaves, typically forming wood in trees.

Cork Cambium

A layer of tissue in plants that produces cork cells to replace or augment the plant's outer epidermis, contributing to the bark's development.

Secondary Phloem

The part of a plant's vascular system that transports nutrients and is formed after the primary growth phase.