Sheena and tina are identical twins who developed from a single zygote and share identical dna. nevertheless, as they develop, differences in physical and psychological characteristics become evident. these differences are due to:

These differences are due to the different environmental factors the twins are exposed to in their lifetimes. 

Environmental factors that affect physical characteristics include the food that they eat, the air that they breathe and even exercise habits.

Environmental factors that affect psychological characteristics include the different experiences they may have in life, possibly because of staying in different locations with different environments.

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.