Variation Is Limited within Kinds
Plants and animals were originally created with large gene pools within distinct created kinds. A large gene pool gives a created kind the genetic potential to produce a variety of types within the kind, allowing the offspring to adapt to varying ecosystems and ensure the survival of that kind of organism.
Genetic potential can best be understood by observing the large number of dog breeds. There are many shapes, sizes, and colors of dogs, illustrating the tremendous genetic potential in this kind of animal—but they all remain distinctly recognizable as dogs. Other kinds of plants and animals have similar potential to produce variety within their own created kinds.