Which of these instruments is best used for observing a single-celled organism? a) hand lens b) watch glass c) light microscope d) electron microscope

I think your best choice would be D. electron microscope. Hope this helps! ^_^

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.

Ten percent of energy is transferred from sun to the level indicated.