Why of the following is thought to be engulfed by prokaryotes eventually leading to the development of animal cells

Mitochondria

Explanation:

The most supported theory is the endosymbiotic theory. This theory states that long ago, prokaryotic cells engulfed mitochondria. The strongest evidence that supports this theory is mitochondria contain different DNA, compared to our cell's nuclear DNA found in the nucleus. This evidence suggests that mitochondria originated from another "body".

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.