Original video : brbrHappy World Oceans Day! We've teamed up with the SpongeBob SquarePants team to delve a little deeper into the oceans and find out what plankton has done for us.br br Subscribe to BBC Earth: BBC Earth YouTube Channel: br BBC Earth Facebook (ex-UK only)br BBC Earth Twitter br Visit for all the latest animal news and wildlife videosbr br This is a channel from BBC Worldwide who help fund new BBC programmes.