"next, take them dry ingredients and mix them into the eggs and oil," is an example of which grammatical error?

This is an example of a basic grammatical error. 
Proper grammar is important as it helps people to communicate clearly and effectively. The most common errors in grammar are related to spelling, punctuation, word choice, and sentence structure. It is important to ensure good grammar, by avoiding the basic grammatical errors.

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.