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

[EX Q]: Passage: It's much easier to precisely make mirrors than to precisely make glass lenses. For that reason, reflectors can be made larger than refractors. Larger telescopes can collect more light. This means that they can study dimmer or more distant objects. The largest optical telescopes in the world today are reflectors. Telescopes can also be made to use both lenses and mirrors. Answer: destroyed
[EX A]: What happens to old oceanic crust at convergent boundaries?

[EX Q]: Passage: Adolescents may have mood swings because of surging hormones. Answer: surging hormones
[EX A]: Many adolescents experience frequent mood swings. name one of the causes for this.

[EX Q]: Passage: Frogs The frog order also includes toads. Unlike other amphibians, frogs and toads lack a tail by adulthood. Their back legs are also longer because they are specialized for jumping. Frogs can jump as far as 20 times their body length. That's like you jumping more than the length of a basketball court! red-eyed tree frog. Answer: jumping
[EX A]:
Frogs and toads have long back legs which are specialized for what action?