1. A (keeping the severed part alive)
2. C (teens usually fight because of bad past)
3. C (always knowing the right thing to do at all times)
Natural barriers include the skin, mucous membranes, tears, earwax, mucus, and stomach acid.
Protein and iron build strong and flexible bones. A diet that lacks these nutrients can lead to osteoporosis.
C..................................................................................................is your answer
