What is a group of organisms capable of interbreeding and producing fertile offspring.

The term for a group of organisms capable of interbreeding and producing fertile off spring is a species. According to the dictionary definition, you can distinguish different species from each other by the organisms' ability to mate and produce fertile offspring. If organisms of different species mate, they will be unable to produce fertile offspring.

Hope this helps. Good luck! :)

Ihaven't done that yet, so no idea,but this is not the right place to ask