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Biology makes good use of numbers both small and large. Try these questions involving big and small numbers. You might need to use standard biological data not given in the question. Of course, as these questions involve estimation there are no definitive 'correct' answers. Just try to make your answers to each part as accurate as seems appropriate in the context of question.
Extension: Try to improve your estimates by giving a range of numbers between which you know the true answer lies.
Work with numbers big and small to estimate and calulate various quantities in biological contexts.