The correct option would be the Mesosphere.
The earth has 4 systems, otherwise known as spheres. These include:
- The atmosphere: the portion of the earth containing air.
- The hydrosphere: the portion that contains water.
- The biosphere: the portion that contains living organisms.
- The lithosphere: the rocky, otherwise known as the outer portion of the earth
Hence, the only option that is not part of the four spheres of the earth is the Mesosphere.
More on the earth's sphere here: https://brainly.com/question/24215268
