Yes. Cows are mammals. Therefore they have backbones.
A pair of oxen is called a team of oxen or a yoke or oxen.
No there is more with backbones
No. Ox is singular, oxen is plural.
No backbones
Pigs do have backbones.
it has 2 backbones
All snakes have backbones.
Ox is not the plural of oxen. Ox is singular; oxen is plural.
Yes, they do.
no myriapods don't have backbones
all fishes have backbones
The backbones are part of the skeleton.