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1) Sponges have internal surface area with lots of tiny holes to hold water.Our lungs are not very big, so how can they have large internal surface area? 2) Why do our lungs need to have a internal surface area? |
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Answer» 1) Sponges have internal surface area with lots of tiny holes to hold water.Our lungs are not very big, so how can they have large internal surface area? 2) Why do our lungs need to have a internal surface area? |
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