Which of these describes one way that the human nervous system maintains a constant body temperature when the external temperature is cold? a) the nervous system increases perspiration. b) the nervous system causes digestion to speed up. c) the nervous system causes blood vessels to constrict. d) the nervous system triggers the fight-or-flight response.

check for the pregnancy rating of drug. if its class c or d see if other alternatives

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.