Do you mean alive or dead (fossils)?
it has no bones
No, but their close relatives were alive in prehistoric times
Some sea creatures have ansetors of dinosaurs
Cement is mainly composed of limestone, (with the carbonate and the water of crystallization removed), and that was once minute sea creatures. So yes, it was once alive. But probably not sentient.
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.
Poseidon responsible for an array of phenomena, predominantly the sea. He also needs to respect and keep alive most offf the creatures in the sea.
get to the sea alive
No there are not any new creatures at miami bech
all the sea creatures are on the bottom of the ocean love dakotah
Dolphins are sea creatures but they are also mammals like whales.
Antarctica is a continent. No sea creatures live on land.