[christianhomeschoolmommaof3]

YOU SAID “So how do you explain that fact that due to speciation different species can no longer interbreed?””

I SAID “Reproductive isolation has caused them to LOSE the ability to interbreed. A loss of genetic information is the exact opposite of what you need for macroevolution.”

I was agreeing with YOUR statement that different species can NO LONGER INTERBREED. I made no assertion.
If you need something in writing here is a link to a book. It isn’t a creationist book.
http://www.nap.edu/openbook.php?record_id=4978&page=41
Second full paragraph down.

Maybe I am not understanding your question.

[Ira_Louvin]

What empirical evidence do you have to support the assertion “Reproductive isolation has caused them to LOSE the ability to interbreed. A loss of genetic information is the exact opposite of what you need for macroevolution.”