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2015-09-20T20:16:00+08:00

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Well biologists just found classifying things complicated. It just takes time to conduct studies and research their origin in order to better classify them.
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2015-09-20T20:17:13+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.
Because there are many places, like forests, seas, oceans, etc. species are not yet discovered. 
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YEAH right! and theres still so many places in earth that are never been explore d.