instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Surface tension is responsible for the fact that small insects can walk on water.
answer:
Surface tension is responsible for the fact that small insects can do this on water?


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


question:
Polar climates include polar and alpine other kind of tundra.
answer:
Polar climates include polar and which other kind of tundra?