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bagirrra123 [75]
3 years ago
9

Tiny sacs in the lungs where oxygen exchange takes place. fundamental working unit of the nervous system. sometimes called the m

aster gland.
Biology
1 answer:
lbvjy [14]3 years ago
5 0
The answer for the first one would be the Alveoli 

the second one is the pituitary gland
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