Marrow, spinal fluid, nerve roots and nerves
Yes.
No. A good example is humans; Humans certainly do have a backbone, but no exoskeleton (well, I don't, anyway).
Yes , it is of the Chordata, just as humans are. Chordata means it has a backbone.
No, humans are vertebrate's, we have a backbone.
Yes we are. A vertebrate has a backbone!
Due to presence of backbone .
Inside the veins and arteries
Vertebrates have backbones. Examples are dinosaurs, humans and eagles. Invertebrates have no backbone. Examples are ants, squids and trilobites.
Yes, a toad has a backbone just like humans for the same use.
Any of the hominids (monkeys, apes, humans) are among the animals that have two legs and one backbone.
The spine or the backbone.