Shark, stingrays, eels and rabid dolphins.
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.
Pink dolphins are not dangerous. They are cuddly creatures of the sea.
Some sea creatures have ansetors of dinosaurs
If you mean, "are all under water creatures, sea creatures?" then no. The term SEA is for the ocean and there also can be creatures in freshwater. Also some creatures that live in water such as some snakes and sea turtles come out of the water every so often, so they are no total sea/water creatures. Fish are underwater creatures though.
both because some sea creatures eat others. unlike cuttlefish they try to eat eachother.i hope this answers your question.
some
These are only SOME of the sea creatures...: Pale octopus, Yeti cram, sea anemones, stalked barnacles and a seven-pronged starfish.
There are many Antarctic sea creatures. Five of these amaizng creatures are an Antarctic octopus, sea spiders, tunicates, marine woodlice, sea lemons. Also Polarbears are not sea animals but howver they od swim in the cold waters of Antarctica
There are some pretty weird creatures living at the bottom of the sea, the most famous is the giant squid.
whale and fish of course
Mary M. Cerullo, Michael Wertz, Jeffrey L. Rotman
narwhal, nautilus