instruction:
Given a statement, generate a question such that the answer is contained in that statement.
question:
eagle eggs have hard, calcium carbonate shells
answer:
What type of shells do eagle eggs have?


question:
a sifter is used for separating combined constituents
answer:
What is used for separating combined constituents?


question:
the fallopian tubes are used in giving birth to babies
answer:

What are used to give birth to babies?