Water swirls in a tiny vortex created by coral polyps, which create miniscule currents by beating whip-like appendages called cilia. The resulting whirlpool helps coral draw in nutrients and push away... more 
Water swirls in a tiny vortex created by coral polyps, which create miniscule currents by beating whip-like appendages called cilia. The resulting whirlpool helps coral draw in nutrients and push away waste. This image won first place in the ph less 
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LiveScience.com | Photo by Vicente I. Fernandez, Orr H. Shapiro, Melissa S. Garren, Assaf Vardi, and Roman Stocker; Massachusetts Institute of Technology
Thu, Feb 6, 2014 19:10 GMT