| 11. | The human digestive tract is sterile at birth but rapidly acquires organisms.
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| 12. | Next were the spleen, kidneys, bladder and more of the digestive tract.
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| 13. | In very small doses, it causes the human digestive tract to convulse.
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| 14. | In volunteers with intact digestive tracts, the transgene did not survive.
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| 15. | It is toxic to the parasite and kills it in the digestive tract.
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| 16. | They have relatively simple digestive tracts, as is typical of insectivores and carnivores.
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| 17. | B 12 is produced in the digestive tracts of all animals, including humans.
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| 18. | Humans expel colon move fecal matter through the digestive tract towards the rectum.
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| 19. | The fluke completes its lifecycle in the digestive tract of birds.
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| 20. | We suck food into the labyrinthine twists and turns of our digestive tract.
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