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2015-02-11T13:43:05+08:00

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The greatest contribution of plants is oxygen, a gas needed by all living creatures in order to breathe...

--Mizu
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2015-02-11T19:59:24+08:00

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
The greatest contribution of plants is the production of oxygen and food for some organisms.

hope it helps :D
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