no they don't have backbones
sharks have backbones and they are fish
Animals that have backbones are considered vertebrates, while animals without are invertebrates. So sharks, having backbones, are vertebrates.
Sharks and their relatives have cartilage.
It is a vertebrate. They have backbones.
There are about 58,000 known species with backbones, these include; sharks, mammals, birds, amphibians, reptiles, rays and (some types of) fish.
Oviviparously
No! They are made of cartilage.
clown fish,mudfish,catfish,seahorse
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Sharks are vertebrates (they belong to the phylum Cordata), so they have a spinal chord. However they are also cartilaginous fishes (they belong the the class Chondrichthyes) meaning that their skeleton is made of cartilage instead of bone. They do have a cartilage sheath that surrounds their spinal chord which could be considered a spine. There could be a semantic debate over whether that constitutes a spine, but I for one think it does.
Yes, but they are different from other vertebrates in that their backbones are made of cartilage, like the rest of their skeletal structure.