TASK DEFINITION: Given a scientific passage and an answer, generate a question for the given answer.
PROBLEM: Passage: 16.3 Circulatory and Respiratory Systems Animal respiratory systems are designed to facilitate gas exchange. In mammals, air is warmed and humidified in the nasal cavity. Air then travels down the pharynx and larynx, through the trachea, and into the lungs. In the lungs, air passes. Answer: nasal cavity

SOLUTION: In mammals, air is warmed and humidified in what?

PROBLEM: Passage: rates The rates at which reactants are consumed and products are formed during chemical reactions vary greatly. We can identify five factors that affect the rates of chemical reactions: the chemical nature of the reacting substances, the state of subdivision (one large lump versus many small particles) of the reactants, the temperature of the reactants, the concentration of the reactants, and the presence of a catalyst. Answer: catalyst

SOLUTION: The presence of what, which acts as a trigger, affects the rate of chemical reaction?

PROBLEM: Passage: Matter can be classified as transparent, translucent, or opaque depending on how it interacts with light. Answer: opaque

SOLUTION:
Depending on how matter interacts with light, it can be classified as transparent, translucent, or what?