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“And you propose what, exactly, to replace it?
Do you imagine some Designer working in His laboratory, every few million years creating new sets of DNA which He somehow injects into old species, causing them to transform and advance towards the varieties we find today?

And you call that “science”?
That's not science, it's not even true religion, it's just wild & rambling imagination.”

I don't propose anything other than random mutation and natural selection to achieve new life forms has not been observed conclusively nor has, even on paper, a truly mechanistic path been proposed for changing a fin into a leg (for example). I realize that intelligent design, creation by a superior intellect, etc. is not “science” as defined. Doesn't belong in the classroom. However, it is fair in the classroom to point out Darwinian evolution to new body plans has not been proved, nor has its mechanism for change to new life forms even been proposed in detail for even one example.

Mudtiger: "I don't propose anything other than random mutation and natural selection to achieve new life forms has not been observed conclusively..."

Now you're just playing word games.
Descent with modifications and natural selection are confirmed observations = facts.
Evolution Theory simply projects the facts backwards in time millions and billions of years to conclude that all life, or nearly all, grew from common ancestors.
The theory is confirmed by fossils, DNA and many other scientific inputs.

So what, in your words, is "a new life form"?
A new breed? That can be done in just a few generations.
A new species? The fossil record and DNA analyses show that those can take a million years or generations.
A new genus? Maybe ten million years / generations.
Etc.

My point is: fossils and DNA prove that in the longer terms "life forms" change in the same way we can see them changing shorter term, only more so.

Mudtiger: "However, it is fair in the classroom to point out Darwinian evolution to new body plans has not been proved, nor has its mechanism for change to new life forms even been proposed in detail for even one example."

Utter nonsense and sophistry.
Your use of the words "new life forms" is gibberish scientifically.
And the mechanisms for descent with modifications and natural selection are well known and described in detail in scientific literature.

The fact that some people won't read the scientific literature doesn't mean it's not there.