Humans created it ~ nixkorskittles :D
I would say the priority of the nursing intervention would be to find out what these pills are ie the name and compostion and effects of them to ensure they will not harm the patient or have not already harmed him or her and thus remove the concern over the type of pill. Chances are that it would be something innocuous like aspirin or tylenol but that would have to be determined for sure.
Yes animals and plants use oxygen in respiration to produce carbon dioxide. All living things carry out cellular respiration 24 hours a day.
C. because you may only have one manipulated variable to be able to know the responding variable.