The length of a human embryo at 8 weeks of development is approximately 20 mm. The diameter of a typical human cell is approximately 0.02 mm.
How many orders of magnitude are there between the size of the human embryo and the size of the typical human cell?
40 exam-style questions on OCR GCSE Biology 1.1 Cell structures, covering 1.1.1 Viewing cells with light microscopes, 1.1.2 Sub-cellular structures and functions, and 1.1.3 Electron microscopy and resolution. Each one has a worked solution and a mark scheme showing where the marks go.