Give me the right answer and i will mark ! which is an example of an internal stimulus? a. a sudden change of air temp. b. an artificial light that attracts insects. c. an increase in the amount of water available to a plant. d. a decrease in oxygen levels in the blood during exercise.

dz nuts.   eeneneneeenenne

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.