The narrator, an unnamed yellow prawn-goby; Maris Wicks (cameo)
Coral are animals, not plants. They are invertebrates who belong to a group of animals called cnidarians. Coral live in colonies which form reefs over a period of millennia. They have a symbiotic relationship with zooxanthellae, a species of algae.
Life on earth developed about 3.8 billion years ago. It evolves and diversifies in response to local and global environmental changes. Many marine invertebrates have been around millions of years. There are three major formations of coral reefs, which can take from 10,000 to 30 million years to form: fringing reefs, barrier reefs, and atoll reefs. Most coral are Reef builders. Coral reefs occupy 0.1% of the planets surface, but are home to 25% of all animals in the ocean. They are deeply embedded in a large marine food web, and play a large role in global ocean health.
Description of the system used to classify living organisms, and an overview of many species of coral and other organisms that inhabit their ecosystem, such as other cnidarians, other invertebrates, fish, sea turtles, dolphins, and humans.
Water and the water cycle are integral to life on earth. Surface runoff from land, affects marine life, particularly when it contains pollution. Algae and phytoplankton produce 60-70% of the world's oxygen, therefore they are integral to life on earth. Thus the oceans are tied to many food webs. Over one billion people (1/7 of world population) are directly dependent on the ocean and marine ecosystem for survival.
Man made climate change is having a negative effect on most of the planets ecosystems, which typically experience changes over much longer time spans. Rising oceanic temperatures cause coral bleaching. Rising temperatures cause zooxanthellae to leave the coral, causing the coral to become unhealthy. Increased carbon dioxide levels cause the ocean to absorb more carbon dioxide, which leads to ocean acidification. This is harmful to coral and other shell forming animals. Pollution also damages marine life.