Macroevolution n (1939): evolution that culminates in relatively large and
complex changes, (as in species formation)
Speciation brings about a new population that is reproductively isolated
from the parent population. That ensures that the different
characteristics of the new population will survive -- at least for a time.
The changes may be very small, but they persist. So it would seem that
speciation -- which I believe many young-earth creationists now accept --
is the fundamental process needed for macroevolution to occur.
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Bill Hamilton
Staff Research Engineer
Chassis and Vehicle Systems
GM R&D Center
Warren, MI