They really aren't directly related, as domestic cats and big cats are in different subfamily, but still fall under the family Felidae. Domestic cats are in the subfamily Felinae, whereas big cats...
because the cat, sci. name felis lybica, is considered a wild cat, but is thought to have formed a mild mannered, smaller version of them, known as the abyssinian. but all cats are just a smaller...
This depends on the individual cat, and what breed it is. Some breeds of cat are very large, and in the case of the Main Coon breed, can weigh anywhere between 5-11kg (10-25lb). Domestic Shorthair or...
Sizes vary widely on breeds and genes, but the average house cat is about 45cm long, but I have seen house cats almost a metre long, so they vary heaps.