Imagine five cells, each of a different shape and all requiring oxygen. Which of the following would have the most satisfactory oxygen supply? Why?

1. A cube 1mm on a side.
2. A cylinder 1mm long and 0.1 mm in diameter.
3. A cylinder 10 mm long and 0.1 mm in diameter.
4. A flat disk 0.1 mm thick and 1 mm in diameter.
5. A sphere 1 mm in diameter.
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