Which of these can be found in both gymnosperms and angiosperms?
a)vascular tissue and flowers
b)vascular tissue and seeds
c)flowers and vascular tissue
d)enclosed seeds and flowers

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.