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

Q: Collision frequency is greater for homogeneous category of catalysts, which also tend to be more sensitive to temperature and more 'expensive'.

A: Collision frequency is greater for what category of catalysts, which also tend to be more sensitive to temperature and more 'expensive'?
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Q: Terrestrial biomes are associated with land, while aquatic ones are associated with water.

A: Terrestrial biomes are associated with land, while aquatic ones are associated with what?
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Q: Increase with age do parathyroid hormones react as a body ages.

A:
How do parathyroid hormones react as a body ages?
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