the structural and functional unit of lungs
1.nephrons
2.chlorophylls
3.alveoli
4.neurons
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ᴀʟᴠᴇᴏʟɪ ᴀʀᴇ ᴛʜᴇ sᴛʀᴜᴄᴛᴜʀᴀʟ ᴀɴᴅ ғᴜɴᴄᴛɪᴏɴᴀʟ ᴜɴɪᴛ ᴏғ ʟᴜɴɢs
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