Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

[EX Q]: Environmental changes is most responsible for the extinction of most species of plants and animals that have lived on earth.
[EX A]: What process is most responsible for the extinction of most species of plants and animals that have lived on Earth?

[EX Q]: Like mitochondria, plastids contain their own dna.
[EX A]: Like mitochondria, plastids contain their own what?

[EX Q]: While some climate regions have multiple layers, arid regions are poor for development of soil.
[EX A]:
While some climate regions have multiple layers, arid regions are poor for development of what?