All vertebrates have back bones.
No there is more with backbones
Pigs do have backbones.
No backbones
it has 2 backbones
All snakes have backbones.
all fishes have backbones
The backbones are part of the skeleton.
no they don't have backbones
no myriapods don't have backbones
Yes, they do.
None. They are invertebrates, which mean they do not have backbones, or bones of any type.
All dinosaurs had backbones.