I am currently a head of science and have been for over 13 years. I have taught science to ks3 and Biology to ks4and 5 for 18 years. I have a first class degree in Biotechnology and a Masters in education. I mark externally for Wjec A level ccurrentl, but I have marked a level for Ocr as well for a few years. We all come across areas of science /biology that we stumbled on, let me guide you through.