What is the main difference between primary and secondary succession? A. Primary succession involves plant populations, and secondary succession involves animal populations. B. Primary succession occurs on land, and secondary succession occurs in aquatic environments. C. Primary succession occurs on barren land, and secondary succession occurs where soil is present. D. Primary succession occurs overnight, and secondary succession occurs over hundreds of years.

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.