Larger than A1 in size - The Eukaryotic and Prokaryotic Cells Wall Chart is ideal for your science classroom. Suitable from GCSE to A-Level, it is colourful, concise and outlines the key concepts in this topic. Get it for your classroom from only £5
images of diatoms.....Diatoms are unicellular algae which form distinct and beautiful cell walls from silica. They are widely distributed throughout the upper layers of the oceans of the world, and can also be found in fresh water or moist environments, such as the undersides of plants.