[00:01.88]In the shallows of the coral atolls,
[00:04.60]small jellyfish point their tentacles towards the sun.
[00:09.30]Like many animals here,
[00:11.36]they depend on a close partnership with microscopic algae,
[00:15.60]which turn solar power into food.
[00:20.19]The most famous of these relationships is the reef-forming corals,
[00:25.16]which provide the foundation of the sea's most dazzling ecosystem.