![Coral reefs are some of the most diverse ecosystems in the world.](../sites/default/files/styles/full_width_image_700x400max/public/2019-12/coralreef.jpg%3Fitok=xts0i1DH)
Coral reefs are some of the most diverse ecosystems in the world.
An official website of the United States government
Official websites use .gov
A .gov
website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites..