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

[EX Q]: Modern members of the reptiles group live in many different habitats and are found on every continent except antarctica.
[EX A]: Modern members of what broad animal group live in many different habitats and are found on every continent except antarctica?

[EX Q]: Certain air pollutants form acid liquid when dissolved in water droplets in the air.
[EX A]: Certain air pollutants form which liquid when dissolved in water droplets in the air?

[EX Q]: Cells acquire different identities in an ordered spatial arrangement during morphogenesis.
[EX A]:
When do cells acquire different identities in an ordered spatial arrangement?