Both a human and a chimp are perfectly viable, despite the 2% difference in their genes and the 6% difference in their genome.
So where does this inability to survive come in? What is nonviable or nonfunctional about changing a working protein by 2% into a nearly identical working protein?
How does a 6% change in mostly noncoding DNA lead to non-viability?
If both organisms bridging this divide are viable, what gives you the impression that an organism that “split the difference” would be nonviable?
I did not say that organism would die to do its genetic makeup. I hope you understood that the animal be very vulnerable to attack from other animals if his body were a poorly designed iguana or half-assed bird.
We see micro-evolution every day and is indeed very important. Macro-evolution is nothing more than “ho-hum”, “Gee! That's interesting” ( yawn) to the vast majority of working scientists and health professionals.
Even my daughter's college text book for biology majors had only 4 or 5 pages on macro-evolution. The book was likely 3 inches thick! Evidently, marcro-evolution isn't even that important for **biologists**
She took college biology for science majors when she was only 14. She had had no high school biology. She and I read every page of her assignments aloud, together. This was only in the past 5 years, so I feel I have a fair idea of what is being taught in college these days.