Usually no- they are far too deep underwater for light to penetrate.
Yes. All planets in the solar system receive light from the sun.
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.
from the sun
from the sun i'd imagine
Energy
both but mostly light :)
Some archaebacteria, such as thermophiles, live by hydrothermal vents. They are chemoautotrophs, which means that they produce their own food using energy from the chemicals in the vents instead of using energy from the sun. The energy starts in the vent, then goes to the archaebacteria, then to the organisms that eat those archaebacteria, and so on.
All the time. There is some part of the planet which is always facing the sun and getting light from it.
No. Light can travel in a vacuum.That's why we can receive light from sun even though there exists a vacuum in between Earth and sun.
Heat and light.
No, they do not.
Yes.