Internal respiration occurs A. Between atmosphere and blood.

B. between systemic capillaries and tissue.

C. In bronchi and trachea

Between atmosphere and blood

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.

it cools slower in the earth meaning the crystals have more time to form than lava on the surface