Read this article about the causes of coral bleaching.

http://www.nytimes.com/2010/09/21/science/earth/21coral.html?_r=1&ref=science

While snorkeling or scuba diving in the BVI, have you seen evidence of coral bleaching?  If so, where?  How severe was it?

Watch this video explaining how the Cuckoo bird ensures that its egg is cared for and survives.  How does this adaptation work in the same way as the color of the coats of the Arctic Foxes below?

The pictures below are of a mammal called an Arctic Fox.  It lives in an extremely cold climate.  During the winter, the fox grows a bright white coat that is very thick.  During the brief summer months, the same foxes shed to a darker, thinner coat.  Why does the fox have a thick, white coat in the winter and a dark, thin coat in the summer?  How did the foxes develop these adaptations?