Your argument fails on three counts.
Morphology does not mean surface features; it means the physical structure of the animal. Scientists were perfectly able to distinguish superficially very similar animals (such as Echinacea and Hedgehogs) using morphology long before genetic analysis became available, indeed before evolution was even identified.
Humans and chimps have
far more morphological differences than even the most diverse of dog breeds - whose differences amount to variations in size and shape without any significant changes to the underlying body structure or muscle groups. Humans have significantly different jaws, hips, legs, feet, muscle structure, head shape, spine organisation and brain structure.
Dogs are considered the same species because they can interbreed; chimps and humans cannot. And are also an example of artificial selection which, frankly, bends things somewhat.
This message has been edited by Mr Jack, 09-02-2005 04:34 AM