Call a biology instructor at your local high school or college. Occasionally, you will run across someone who does not have time for you, but most of these people live to give advice and will be flattered by your questions. If you do not have computer, check with your library or even with a friend for WEB access to help you research resources. On the WEB, you will want to acquaint yourself with one or more search engines. If your child is exploring the WEB for the first time, have him enter a search term for a current interest.
Examples are astronomy, skiing, wildlife, and so on.
Some homeschooling organizations and authors are particularly informative. They may not know the answer, but they can help you find who does. Here is my short list, together with examples of what they can provide. National Home Education Network, PO Box 41067, Long Beach, California 90853. Read my newly released book replete with resources and contact phone numbers and web sites for everything from the three R s to driver s training.