Given a scientific passage and an answer, generate a question for the given answer.

[Q]: Passage: Kevin Walsh. Cows are able to digest grass with the help of the bacteria methanogens in their gut . CC BY 2.0. Answer: bacteria
[A]: A type of what in a cow's gut enables the animal to digest grass?

[Q]: Passage: Modern reptiles live in many different habitats. They can be found on every continent except Antarctica. Answer: reptiles
[A]: Modern members of what broad animal group live in many different habitats and are found on every continent except antarctica?

[Q]: Passage: Moving air, like moving water, causes erosion. Moving air is called wind. Answer: wind
[A]:
What is moving air called?