annasocce15
annasocce15 annasocce15
  • 25-01-2021
  • Biology
contestada

In and out, it's all we know. We do it more when you are on the go! Even sleeping, in and out...it always happens without a doubt.
A.Immune System
B.Respiratory System
C.Digestivs System
D. Nervous System
E. Circulatory System
F. Musulsketal System ​​

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xavierrizk
xavierrizk xavierrizk
  • 25-01-2021
You are always breathing. Answer is B.
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