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Great Barrier Reef - #Australia. Featuring 400 types of coral, 4,000 types of mollusk, and 1,500 species of fish, the Great Barrier Reef is the largest reef system on Earth. It was named a World Heritage Site in 1981, and is one of the most popular tourist destinations in Australia.

Top 14 must see places in the world

Great Barrier Reef - #Australia. Featuring 400 types of coral, 4,000 types of mollusk, and 1,500 species of fish, the Great Barrier Reef is the largest reef system on Earth. It was named a World Heritage Site in 1981, and is one of the most popular tourist destinations in Australia.

Jellyfish do not have a respiratory system since their skin is thin enough that their body is oxygenated through diffusion.

Jellyfish do not have a respiratory system since their skin is thin enough that their body is oxygenated through diffusion.

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