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1. 
Which organ do mammals use to breathe?
A.
Heart
B.
Lungs
C.
Brain
D.
Mouth
2. 
Mammals are....
A.
Cold-blooded
B.
Warm-blooded
3. 
Mammals are...
A.
Viviparous
B.
Oviparous
4. 
Mammals can´t fly.
A.
False
B.
True
5. 
Mammals are omnivores and herbivores.
A.
True
B.
False
6. 
Mammals can be terrestrial and aquatic.
A.
True
B.
False