Proper combustion in a gas furnace is shown in a flame that burns the color _____.

An intermittent-pilot ignition system burns and monitors its pilot light _____.

A single-port burner that directs the mixture of air and fuel gas through a large orifice to produce a large flame is a(n) _____ burner.

As the amount of excess air increases, _____.

Combustion blowers are used in _____.

Chemical A has a toxicity level of 4 and Chemical B has a toxicity level of 6. When they are combined, the toxicity level is 15. The effect of the chemical interaction is _____

When individuals of the same species are trying to get a limited resource for themselves, what is the interaction called?

Which of the following can tell us if two events are connected in a cause and effect relationship?

In what stage of the demographic transition do birth rates begin to fall, while still outnumbering deaths, thereby slowing population growth?

Green building design, as specified by the LEED program, promotes _________