Several reasons why cross-species change cannot occur. Natural selection sounds like a good idea, because, all about us, we see variation within species. All the offspring produced in the plant and animal kingdom remain in the same species. The production of new creatures never occurs. Evolutionists can never admit that any intelligence was involved in the formation of squirrels, humming birds, or human beings.
Evolutionary theory requires change by random action alone.
Yet, if even half those random changes were positive, the other half would have to be damaging. Charles Darwin said that natural selection made every single transition from one species to another. Those who adhere to natural selection as the only way evolution can occur are called Darwinists or Darwinian evolutionists. But, earlier in this century, some evolutionists already recognized that natural selection was a laughing stock and never produced new species. So they said that the trans-species changes were made by mutations and only the finishing touches within a species was done by natural selection.