Coral reefs are one of the oldest types of living systems on earth, and certainly one of the most spectacular. They are massive underwater structures formed by the limestone skeletons of tiny invertebrate animals. Reefs house a greater diversity of body forms, chemistry, and animal phyla (thirty-two compared to the eight that inhabit the most biodiverse ecosystems on land). Phyla comprise the second largest category of living things, after kingdoms. Coral animals begin life as …showed first 75 words of 3366 total…

…showed last 75 words of 3366 total…the next ten to twenty years to clear up water around the Keys and Florida Bay. Under the plan, some Key reefs will be off limits to visitors, and on others, limits or prohibitions will be placed on how many fish, shells, and other animals can be removed.. The purpose of the Environmental Protection Agency's five-year Reef Monitoring Project is to determine what causes reef damage so these fragile ecosystems can be protected more effectively.