Then you haven't been paying attention to modern science. Would you dare claim that human organs are growing in laboratory pigs due to unaided, natural Evolution, after all?!
Clearly Intelligent Design is supported by testable content by merely looking at such human/pig lab experiments wherein Man has used gene-splicing.
If you want to see where Intelligent Design offers testable and already supported content, then look first in modern scientific labs. The pigs are there.
Those are not human organs growing in pigs. Those are pig organs growing in pigs that have an expressed gene for a human cell membrane protein that helps mask the cell surface and reduce the rate of tissue rejection that always occurs with transplants.
Why do you suppose a pig organ can be used in place of a human organ? Could it be because the pig and the human are distant relations? Let's see -- both are vertebrates, both are mammals -- yes indeed, they are related after all.