Which of the following are true? question 2 options: primary succession begins in an area that does not have soil. secondary succession occurs in an area that already had life and soil. primary succession begins in an area that did not have life before. all of these are true.

I believe all are true.

Explanation: Primary succession occurs after a natural disaster were no life is. Secondary succession begins where there is life already

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.

idk

explanation: