Science Please HELP!!!

Which of the following are structures that rely on capillaries for exchange or movement of small molecules?

1 teeth, aorta, ureter
2 cartilage, epidermis, larynx
3 nephron, villi, alveoli
4 leukocytes, atrium, bronchi
answer #2

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asked by Sam
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  2. whoops 3 i meant

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