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.
Requirements for becoming a preschool teacher rely heavily on the school's location, though all states require licensure and training in early education. A minimum of a high school diploma or associate's is often required, however most preschool teachers for public schools must earn a bachelor's degree. A Child Development Associate (CDA) certificate is a common credential that is required by many states. CPR and first aid certification may also be required.