Weird and wonderful

2nd November 2007, 12:00am

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Weird and wonderful

https://www.tes.com/magazine/archive/weird-and-wonderful-22
Blood makes up 7 per cent of the human body and the average person has five litres. Mammals’ blood is always red due to the iron-based haemoglobin in red blood cells. The blood of most molluscs and a few arthropods has a blue tinge because it contains copper-based haemocyanin.

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