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10 December 2009
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You are here: BBC > Science & Nature > Animals > Sea Life > Blue Planet Challenge
Introduction What you'll explore Master the challenge Take it further
Your challenge
Explore one of the most beautiful, colourful and diverse ecosystems on the planet - a coral reef. Find out how different species interact and compete with one another in these crowded underwater cities.
Just for fun Just for fun Just for fun
See if you can pick out perfect pairings on the reef. Work out which combinations of creatures form a terrific team and which are more likely to spell disaster!

If you don't have Flash 5 you can download it from here free.

Play the game


Move on to the next stage and find out what you need to know in order to explore life on a coral reef.

You can find out about food chains, webs and pyramids and take a closer look at a few of the creatures that make coral reefs their home, from microscopic plankton to the largest fish in the sea - the mighty whale shark.


Many people think that Mount Everest, at 8,848m, is the tallest mountain on Earth. However, Mauna Kea, an inactive volcano off the island of Hawaii, is actually taller. Although only 4,205m (13,800ft) of Mauna Kea stands above sea level, it is in fact over 10,000m (6.2 miles) tall if measured from the ocean floor to its summit.


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