Seconding
Jazzns.
For 'kinds' to work as a scientific term--which is necessary if you want this concept to be taught in public school science classes--it first has to be given a
scientific definition.
You assert:
Living things only evolve within the limits of their 'kind.'
The statement has a logical corollary:
Living things do not evolve outside the limits of their 'kind.'
Practically, the definition of 'kind' becomes 'that range outside of which living things cannot evolve.'
We now need to test this idea through observation and experiment. Here's the catch: in all research to date,
no intrinsic barriers to evolution have been found. What we find is that genetic variation can go and go and go. Over time the accumulated variations can add up to some spectacular changes.
It is thus up to those who think intrinsic barriers on evolution exist (at the boundary of 'kinds') to state where the barriers are. Scientists may then begin testing.
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