How can carbon dioxide be considered a pollutant when it is a natural component of air?

a. Carbon dioxide is considered a pollutant even though it is a natural component of air, because it is harmful to all living organisms.

b. Carbon dioxide is considered a pollutant when larger concentrations than normal are present in the air as a result of human activity.

c. Carbon dioxide is considered a pollutant, because it forms harmful chemicals when mixed with other pollutants in the air.

d. Carbon dioxide cannot be considered a pollutant under any circumstances.

 

 

 

what component of a motherboard is not considered to be a field-replaceable unit?

which of the following statements regarding working inside a laptop computer is true?

1. When upgrading a laptop, you should use components that are the same brand as the
   laptop or use only recommended components.
2. If an internal component needs replacing, you should always replace the component
   rather than disable it.
3. Repairing a laptop is always more cost-effective than buying a new one.
4. The LCD screen of a laptop is never considered to be a field replaceable unit.

which access control model is considered to be the least restrictive?