Creationists and ID proponents: What is the operational definition of "kind"?

When you say that "one kind cannot evolve into another" what exactly does that mean? Can you give me the definition that creationists/design proponents generally use to determine whether or not two different organisms are the same biological "kind"? For example, the biological definition... show more When you say that "one kind cannot evolve into another" what exactly does that mean?

Can you give me the definition that creationists/design proponents generally use to determine whether or not two different organisms are the same biological "kind"?

For example, the biological definition of species says that two organisms are the same species if they are capable of producing fertile offspring. I can use that definition to determine whether or not two organisms I have are the same species.

What definition of "kind" do creationists use to determine which organisms are and aren't the same kind?
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