During speciation, when do two groups become recognized as separate species? a. when they look different. b. when they are separated by an isolation barrier. c. when they cannot interbreed. d. when they are both herbivores.

The answer is C (when they cannot interbreed) because when the new species cannot have offspring with the old species, they do not mix traits.

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.