"which term is the most closely associated with the changes in relative population size shown in graph c?
(1)mutation
(2)artificial selection
(3)genetic engineering
(4)competition"

According to the graph represented above, it does seem to me that the term which  is the most closely associated with the changes in relative population size is 4 - competition. The reason why I choose this option is that there is a couple of population lines which go in totally different ways creating the contrast, as one of the line goes upwards and other one goes down - competition does make sense.
Hope you will agree with me.

If these are the missing choices: a. to determine skin temperature, place the back of your hand against the patient's skin.b. determine body temperature by touching the patient's hands and feet.c. skin temperature will tell you very little about this patient's condition or well-being.d. the patient's skin temperature and color will likely be warm and red.my answer is: a. to determine skin temperature, place the back of your hand against the patient's skin. using the back of the hand to check for temperature rather than the palm is more effective because the back of the hand has more nerves that can feel and transmit the temperature than the palm.