We can also say that all creatures come from their own kind. Never does a cat have a puppy, always a kitten. One could say that infinitely back in time, cats gave birth to kittens, and dogs to puppies . Different creatures are called species from the Latin for outward appearance .
Outward appearance can be misleading.
Fox terriers breed fox terrier puppies. A poodle and fox terrier can interbreed, producing puppies with characteristics of each parent. These are different varieties of the same species. People are the same. All can interbreed.