Which of these is a characteristic of sexual reproduction? a) it takes place in all cells of the body. b) it forms exact copies of the parent cell. c) it results in offspring with genetic variation. d) it requires only one parent to form a daughter cell. which one is right.

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.