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1. 
Where ocurrs the gas exchange?
A.
Diaphragm
B.
Alveoli
C.
Nasal cavity
2. 
In your body there are three types of blood vessels:
A.
Plasma
B.
Veins
C.
Capillaries
D.
Arteries
3. 
The excretory system consists of
A.
Urinary system
B.
Circulatory system
C.
Sweat glands
D.
Absorption