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

Q: A concave lens is thicker at the edges than it is in the middle.

A: What type of lens is thicker at the edges than it is in the middle?
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Q: Do particles collide more in two reactants fluid they are both in fluid forms or solid forms.

A: Do particles collide more in two reactants when they are both in fluid forms or solid forms?
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Q: Digestion and respiration are both facilitated by the pharynx, more commonly called the throat.

A:
Digestion and respiration are both facilitated by the pharynx, more commonly called the what?
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