Given a scientific passage and an answer, generate a question for the given answer.

Ex Input:
Passage: Electronegativity is a qualitative measure of how much an atom attracts electrons in a covalent bond. Answer: electrons

Ex Output:
Electronegativity is a qualitative measure of how much an atom attracts what in a covalent bond?

Ex Input:
Passage: Momentum is a vector quantity that has the same direction as the velocity of the object. Answer: object ' s velocity

Ex Output:
Momentum is a vector quantity that has the same direction as what?

Ex Input:
Passage: invertebrates produce uric acid. Animals that secrete urea as the primary nitrogenous waste material are called ureotelic animals. Answer: urea

Ex Output:
The primary nitrogenous waste material secreted by ureotelic animals is what substance?