Final answer:
True. Wool fiber may be used in a commercial building for its insulating properties and ability to retain warmth even when wet. Wool is often used for insulation purposes in commercial buildings.
Step-by-step explanation:
True. A wool fiber may be used in a commercial building for its insulating properties and ability to retain warmth even when wet. Wool is often used in commercial buildings for insulation purposes to help reduce energy consumption for heating. It holds air still in its matrix, preventing heat loss and providing effective insulation.