Carbon is an element that is found in all living organisms, so the cycling of carbon through these organisms is essential to sustaining all life. Which process is one way that a living organism is involved in the movement of carbon around the earth

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.

i think the answer is a.keratin is the pigment responsible for skin color.

the planets have a circular orbit around the sun.