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What are appropriate organisms to use in educational demonstrations?

What are appropriate organisms to use in educational demonstrations? Plants, or Sea Sponges, or Anemones, or Jellyfish, or worms, or insects, etc? Or none whatsoever? What is your line? Are plants suitable but animals not? Or are animals suitable so long as they do not have neurons? Or are animals with neurons suitable so long as they do not have a centralized brain? [question of Timothy]

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    May 7 2012: One does not have to use dissection in classroom unless it is necessary to convince the audience.
    Galvani demonstrated that neurons use electricity, and did not have to dissect any frog,
    (Frog was presumably killed in preparation of a dinner ?) His experiment was easier to see, without a microscope
    and playing music (just for cheap effect) appears sadistic.

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