Because that is the only known ecosystem that is not dependent on the sun to sustain life.
There are no animals discovered fully, but some people and scientists have agreed there is 5 species of animal are able to everyone if these.
They both come from the ocean floor? That and it probably has to do with both allowing some type of plant or animal life to survive on the ocean floor.
there could be a dead animal in your vent
vent crab (bythograea thermydron )
These organisms do not need oxygen. They are called anaerobes.
Their ability to derive nutrition from inorganic compounds (Ex. bacteria thriving near deep sea vents spewing sulfur).
There are some organisims that live on and around Hydrothermal vents at the bottom of the ocean, where there is no sunlight at all. They feed off the nutrients that come out of the vents, and so they don't need sunlight.
They can survive in areas of the earth where no other life forms can be found. For example, some of them can't survive in oxygen, and others are found deep inside the ocean vents.
3CO2 + 3C + 6H2O >>>> C6H12O6 + 3O2 sunlight
there is tubeworms and huge clams in the pacifc ocean but eyeless shrimp in the atlantic
Scientists are not quite sure, but it may be due to the bacteria they grow on the "hairs" their pincer arms are covered in. The bacteria that live there are able to convert the toxic chemicals spewed out by hydrothermal vents in a process called chemosynthesis.
Coral reefs rely on photosynthesis to produce their food. This means that they are close to the sun so that the sun can help it produce food. The "deep ocean vents" or hydrothermal vents are 7,000 fett underwater and cannot use the sun for it's food. The vents in the water spew out chemicals that the animals and plants there use to survive. Since it's very, very dark, the animals have adapted to living in those conditions. Most animals have lights or are "bioluminescent" meaning that they have some kind of light in their body that can help them see. A well-known example of an animal that uses bioluminescence is a firefly. ADDED. Essentially the difference is that between living and inert. The coral reef is built up of the exoskeletons of the polyp, a tiny animal. A hydrothermal vent is purely geological: a minerals deposit.