You have found that planet z should have active tectonics and volcanism and an atmosphere produced by volcanic outgassing. what single factor explains why the planet should have these characteristics?

The answer is Planet Z:
1. lacks axis tilt.
2. has a large size for a terrestrial planet.
3. has a slow rotation rate.closely orbits its star.

You can take a single point as a answer but though I am a Expert, I explained in detail.

Africans learned what the europeans wanted them to learn. instead of learning about african history and current information that could and would them they learned solely what europe wanted them to. and not everyone received the same education, some received better and others none.