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

Q: Passage: Describe hurricane formation and the damage they cause. Answer: bacteria

A: Yogurt is made with milk fermented with what?
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Q: Passage: A variable is a factor that can change over the course of an experiment. Independent variables are factors whose values are controlled by the experimenter to determine its relationship to an observed phenomenon (the dependent variable). Dependent variables change in response to the independent variable. Answer: independent variables

A: The values of which factors are controlled by the experimenter over the course of an experiment?
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Q: Passage: Reproduction Fungi reproduce sexually and/or asexually. Perfect fungi reproduce both sexually and asexually, while the so-called imperfect fungi reproduce only asexually (by mitosis). In both sexual and asexual reproduction, fungi produce spores that disperse from the parent organism by either floating on the wind or hitching a ride on an animal. Fungal spores are smaller and lighter than plant seeds. The giant puffball mushroom bursts open and releases trillions of spores. The huge number of spores released increases the likelihood of landing in an environment that will support growth (Figure 24.6). Answer: gas exchange process

A:
What do all respiratory diseases affect?
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