How do stem cells know what type of cells to differentiate into? A. The nucleus has instructions to turn some genes on and some genes off
B. Genes turn on and off randomly
C. Signals from chemicals in the organism or from the environment determine which genes will be turned on and off
D. The cell has unique DNA that determines what the cell will become.

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.

Carbon-14 has a half-life of 5,730 years and most igneous rock is older than that.

Yes yes yes very good