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.

b because they naturally adapt to their environment plz mark brainliest

explanation:

the water is warmed up by the sun and then it evaporates into the atmosphere. the sunlight warms the water by its heat. water is then cooled down and condensation takes place. the water then finally returns back to the earth by the process of precipitation in the form of rain or ice.

explanation: