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작성자 Stewart
댓글 0건 조회 47회 작성일 24-06-14 19:29

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Damage to air sacs can reduce the surface area available for gas exchange, impair the thinness of the membrane needed for diffusion, or Discount on Viagra's homepage disrupt the flow of air
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How many meters is the human digestive tract?

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The human digestive tract is approximately 6-9 meters long.

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