instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
If a substance has a ph value greater than 7,that indicates that it is base.
answer:
If a substance has a ph value greater than 7, what does it indicate?


question:
The metallic bond is responsible for the properties of metals.
answer:
What is responsible for the properties of metals?


question:
Exemplified by baring teeth, aggressive type of displays are common in the animal kingdom, and sometimes serve as a 'bluff'.
answer:

Exemplified by baring teeth, what type of displays are common in the animal kingdom, and sometimes serve as a 'bluff'?