It is not advisable to sleep under a tree at night because of :

(a) release of less oxygen
(b) release of more oxygen
(c) release of carbon dioxide
(d) release of carbon monoxide

Anurag Mishra Professor Asked on 18th January 2016 in Computers.
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    Answer: (c) release of carbon dioxide 

    Anurag Mishra Professor Answered on 20th January 2016.
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