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  2. Coral reef - Wikipedia

    en.wikipedia.org/wiki/Coral_reef

    A coral reef is an underwater ecosystem characterized by reef-building corals.Reefs are formed of colonies of coral polyps held together by calcium carbonate. [1] Most coral reefs are built from stony corals, whose polyps cluster in groups.

  3. Subarctic climate - Wikipedia

    en.wikipedia.org/wiki/Subarctic_climate

    This type of forest is also known as taiga, a term which is sometimes applied to the climate found therein as well. Even though the diversity may be low, the area and numbers are high, and the taiga (boreal) forest is the largest forest biome on the planet, with most of the forests located in Russia and Canada.