help me pls help me pls
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18)b- magnesium
19)c-respiration
20)a -evolved CO2 respiration
21)b-brinchits I think
22)c-niacin pernicious anemia
23)c-joseph priestly
24)b-around 200-250
25)b-alveloli
26)a-pleura
27)a-bile
hope it helps you
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sorry I don't know the answer.
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