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Alex
3 years ago
13

Help! I will give brainliest .

Biology
2 answers:
Elena-2011 [213]3 years ago
8 0
Organ Brain is in the nervous system

Organ Heart is in the circulatory system

Organ lungs is in the respiratory system

The heart is the organ that supplies blood with oxygen.

This is all I know :)

Mumz [18]3 years ago
7 0
This is a very easy thing lll
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