any member of either of two invertebrate subphyla of the phylum Chordata: the Tunicata (sea squirts, salps, etc.) and the Cephalochordata (amphioxus). Like the remaining subphylum of the chordates, the Vertebrata, the protochordates have a hollow dorsal nerve cord, gill slits, and a stiff supporting rod, the notochord, the forerunner of the backbone. The protochordates differ chiefly from the vertebrates in not having a backbone. Recent protochordates are thought to have evolved from the same ancestral stock as that which gave rise to the vertebrates.

They live in waters mainly of the Indian Ocean, Red Sea, and southwest Pacific Ocean. They are herbivore marine mammals. Their species is vulnerable which is near to become endagered.

Nope

The dugong is closely related to the manatee.

It uses it for breeding purpose's. go to the link bellow to find out more.

Yes, dugong are warm-blooded mammals.

types of fish

orange

Yes, they are very cute! But at times they look a little weird.

five or six

the reasons they are endangered are

killed by boats, suffication of nets, lost of habitat and eatble flesh