The chemical substance that is both a hormone and neurotransmitter is:

Without proper training, an Emergency Medical Responder should never enter a smoky room or go through an area of dense smoke

Indicate whether the statement is true or false

Upon which of the following factors is the fire-resistance rating of walls NOT dependent?

A. Type of occupancy B. Type of building construction C. Expected number of occupants D. Presence of automatic sprinkler system