I haven't taught school since I was pregnant with my first child (who's now 21 and graduating from college), but I have taught everything from kindergarten to 8th grade. I've taught science, english, literature, remedial reading, remedial math, first grade, and kindergarten.
Every time I'd go back to get another degree, they'd change the parameters-with my BSED, I could teach anything in grades K-8. With my masters, it was K-6; with my sixth year degree, they squeezed it down to PreK-4th; AND my class was the class that just missed the cut-off for Lifetime Teacher Certificates! We just couldn't win!