J $200
1994
Most fish expel carbon dioxide through these
J $600
2008
(Sarah of the Clue Crew holds a magnifying glass to the underside of a large mushroom in the Jeopardy!lab.) Like fish, mushrooms have these, but in the mushroom they're where the spores are produced
DJ $200
1991
Amphibian larvae have these respiratory organs on the outside of the body