A. menstruation
menstruation happens because each month the body releases an egg. Hence why when youre pregnant you dont experience menstruation, because the egg is fertilized so will not be released
Answer:
A. first class lever
Explanation:
the fulcrum is in the middle of the effort and the load.
Good Samaritan laws would be the answer to your question
B. Tooth Decay - because of the acid from your stomach rests on your teeth.