A biofilm is any group of microorganisms in which cells stick to each other and often also to a surface. These adherent cells become embedded within a slimy extracellular matrix that is composed of extracellular polymeric substances (EPS).
Career Requirements. Kindergarten teachers in public schools are required to have at least a bachelor's degree in education and teacher certification for the state in which they work. Certification typically requires candidates to complete student teaching requirements and pass any required professional exams.
Elementary school teachers normally instruct students in kindergarten through fifth grade on all academic subjects. They work in public and private schools and need a bachelor's degree in education along with license to teach in most states. Average pay for elementary teachers was $55,270 as of May 2011, according to the Bureau of Labor Statistics.