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Figure 2.14 Can a 2-D human have a tubular digestive system without falling apart<br />

into two pieces? (Drawing by Clay Fried.)<br />

Figure 2.15 Perhaps in a 2-D world, only creatures with primitive digestive systems<br />

would evolve—like Earthly planaria flatworms or hydra that only have one opening<br />

in the digestive system. They eat food and expel 2-D wastes from the same<br />

opening.

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