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

Q: Passage: Exocytosis describes the process of vesicles fusing with the plasma membrane and releasing their contents to the outside of the cell, as shown in Figure below . Exocytosis occurs when a cell produces substances for export, such as a protein, or when the cell is getting rid of a waste product or a toxin. Newly made membrane proteins and membrane lipids are moved to the plasma membrane by exocytosis. Answer: exocytosis

A: What describes the process of vesicles fusing with the plasma membrane and releasing their contents to the outside of the cell?
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Q: Passage: Power plants are where electric power originates. They have electric generators that generate electric current through electromagnetic induction. Answer: power plants

A: Where does electric power originate?
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Q: Passage: Although spiders and insects are both arthropods, a spider is not an insect. One key difference is that insects have six legs, while spiders have eight legs. Answer: two

A:
How many more legs do spiders have compared to insects?
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