Ventilation supply systems shall deliver the required rate to the breathing zone, which extends to feet from the enclosing walls.

The correct answer is "2".

Explanation:

The missing options of this question are:

a) 2

b) 3

c) 4

d) 6

The correct answer is option a) "2".

According to the Federal Emergency Management Agency (FEMA) of the United States of America, a breathing zone must be established in order to ensure a proper ventilation supply. The breathing zone is a region that must be kept among systems and the enclosing walls or the floor. In the case of enclosing walls, at least two feet (600 millimeters) must be kept. Regarding the floor, at least three feet must be kept above the floor.

im not in connections yet but i might can you some questions. what grade are you in?

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms