Answer:
1.) Why does menstruation begin?
A.) Period happens because of changes in hormones in the body.
2.) How long does the menstrual cycle usually last?
A.) the menstrual cycle lasts 21 to 35 days while bleeding between 2 to 7 days
<u>-TheUnknownScientist</u>
Usually enzyme inhibitors slow down the enzymes activity, so in this case, I would put D.
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<span>due to their structure and function they are differ from each other</span>
