In each case below the plastic box is full of air and closed. (Continued in "Details" since the rest won't fit).

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by ColorCodedQuotes at April 22, 2011

Box X contains a fern plant. Box Y contains a fern plant and a salamander. Box Z contains a salamander and a log. The boxes are exposed to sunlight, but they are not allowed to become overheated. In which of the boxes would the organisms have the gases they need for survival? Explain the reasons for your answer(s).