Hi, What subjects in Science (life, earth, physical, general science etc.) can one teach in elementary, middle or high schools if one has a single subject credential in one of the areas of Science (lets assume - Biology) in California?? I know some people with a single subjet credential in science teach two different sections (e.g. physical and life) in middle schools. How does that work? I know if you have a specialized credential, you can teach that particular subject in high schools, but not in middle or elementary schools. Please share your inputs. Thanks!