The coral reefs area part of the sunlight zone . Coral reefs can only form in warm, clear, salty water, and only in shallow water. Coral polyp starts its life after its parent coral. The polyp drift on the top of the of the ocean surface until it attack itself to a hard surface. As a young polyp grows it combines calcium and carbon dioxide to make a hard limestone cup around its soft body . The algae and the polyp are partners. The algae make oxygen and some other nutrients that the polyp needs, in return the polyp gives off carbon dioxide and substances that the algae needs. At night the polyp eats plankton drifting within the reach of their stinging, in the day it

The last zone is called midnight zone. With water pressure can exceed 2 ton per square inch, the temperature of the water is near fresh water's freezing point, and it is completely dark. Scientists think that only 1% of all ocean species live here. Most animals that live here are scavenge the remains of dead plants and animals which drift down from the ocean's upper layers. Animals have unique organs and appendages which allow them to function in the near-total darkness. The darkness is not quit total here, because some of the creatures have built in lights, in the form of light producing organs or luminescent patches of skin. These creature use their luminoscity in different ways. Some flash their lights on and off to attract a mate. Others lure their prey within striking distance with special glowing appendages that look like worms or food. Some actually scare predators off with their special luminescent abilities. Also on the sea floor are ridges that unusual vent communities. Th

Some common words found in the essay are:
, Sea Deep, sunlight zone, midnight zone, animals live, zone starts, vent communities, zone water pressure, zone coral reefs, limestone cup, twilight zone, zone water, coral reefs, carbon dioxide,
Approximate Word count = 674
Approximate Pages = 3 (250 words per page double spaced)