No, but their close relatives were alive in prehistoric times
Yes every day by other deep sea creatures.
None, the deep sea is in space
Some dangerous deep sea creatures would include: the giant squid, frilled shark, anglerfish, and goblin shark. Most deep sea creatures pose no threat to humans as they are located at depths in which you would need a submarine to reach.
The deep sea creatures use a sonar type system to send waves and see how long it takes to get back to them ; like a dolphin
· Barracuda
With a tool called a stothiscope.
The Dumbo Octopus is a pretty adorable little fella who lives deep under the sea.
Yes there are many unidentified creatures in the sea. There are parts of the sea that are so dark that only creatures with special adaptations can live there. There are also parts of the sea that are so deep that we cannot go there. The pressure collapses submarines.
Look for them.. Not hard
Yes. These new fish are called deep sea glass squids or Teuthowenia Pellucid.
Estrela do mar . Cavalo marinho . Anemonas
Sea creatures (i think you mean animals) are found in all parts of the sea. However, the pacific ocean holds 1/3 of all ocean wildlife. well mostly the bottom in the deep sea