Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.

Question: Fungi are unique in having cell walls made of what? Answer: chitin
Fungi are a kingdom in the domain Eukarya that includes molds, mushrooms, and yeasts. Most fungi are multicellular. They are unique in having cell walls made of chitin.

Question: Sharing a phylum with insects, spiders, daddy-long-legs, scorpions, and ticks belong to what class? Answer: arachnids
Arachnids include spiders, daddy-long-legs, scorpions, and ticks.

Question: What does an electric conductor cross to generate current? Answer: magnetic field lines
A changing magnetic field produces an electric current in the process of electromagnetic induction. Current is generated whenever an electric conductor crosses magnetic field lines.