TASK DEFINITION: Given a scientific passage and an answer, generate a question for the given answer.
PROBLEM: Passage: An addition reaction is a reaction in which an atom or molecule is added to an unsaturated molecule, making a single product . An addition reaction can be thought of as adding a molecule across the double or triple bond of an alkene or alkyne. Addition reactions are useful ways to introduce a new functional group into an organic molecule. Answer: an addition reaction

SOLUTION: What is a reaction in which an atom or molecule is added to an unsaturated molecule, making a single product?

PROBLEM: Passage: Immovable joints do not allow the bones to move at all. In these joints, the bones are fused together by very tough collagen. Examples of immovable joints include the joints between bones of the skull. You can see them in Figure below . Answer: immovable joints

SOLUTION: The joints that are between the bones that make up the skull are what kind of joints?

PROBLEM: Passage: Old Faithful ( Figure below ) is the best-known geyser in the world. The geyser erupts faithfully every 90 minutes, day after day. During each eruption, it may release as much as 30,000 liters of water!. Answer: old faithful

SOLUTION:
What is the nickname of the best-known geyser in the world, which erupts reliably every 90 minutes?