You are developing a mind map for determining which material is the best conductor of electricity. At which stage in the process will you list each of the individual materials you will use in the experiment?

The central idea is finding the best electrical conductor. The subtopics can identify broader parts of the experiment, while the lower-level subtopics spell out specific details under them, such as each individual material to test. So you would list the materials when defining the lower-level subtopics.

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