Scientists figure out why pulsing corals pulse
By Stephen Ornes
Web edition: May 3, 2013
Water swirlers
Scientists say pulsing corals make their motion to bring in needed nutrients.
Credit: M. Kremien et al/PNAS 2013
Here?s a new exercise: Call it the ?pulsing coral.? While waving your arms slowly in the air, gently bring all of your fingertips on each hand together. Then spread them out again. Then bring them in again. Keep going, opening and closing, every few seconds, all of the time ? and preferably underwater.
Certain corals known as xeniids (ZEE nee idz) do this day and night with only a few breaks. New research now suggests an explanation for all of?that ?hand waving.?
Visit the new Science News for Kids website and read the full story: Motion in the ocean.
Source: http://www.sciencenews.org/view/generic/id/350189/title/FOR_KIDS_Motion_in_the_ocean
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