Miyerkules, Enero 3, 2018

Coral Reef

Coral reefs are diverse underwater ecosystems held together by calcium carbonate structures secreted by corals. Coral reefs are built by colonies of tiny animals found in marine water that contain few nutrients
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1 komento:

  1. Hindi-nagpakilalaEnero 16, 2018 nang 9:44 PM

    Nice. Pero mas mainam kung sarili mong explanation. :)

    TumugonBurahin

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