instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
How much is involved in the reaction does the coefficient in front of an element in a formula indicate.
answer:
What does the coefficient in front of an element in a formula indicate?


question:
Chordates include vertebrates and invertebrates that have a notochord.
answer:
Chordates include vertebrates and invertebrates that have what?


question:
The uterus has an external opening known as vulva.
answer:

The uterus has an external opening known as what?