The purpose of the menstrual cycle is to

Answer to your question is expel an unfertilized egg and endometrium. Menstrual cycle is natures way of getting body ready for future pregnancy. it occures every 21-35 days and it lasts from 3-5 days. Menstrual cycle has it's Phases:Menstrual phase,Follicular phase,Ovulation phase,Luteal phase and The purpose of the menstrual cycle is to expel an unfertilized egg and endometrium which prepares body for pregnancy.

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The type of rock she find is a sediment rock

Answer : romans built laws to manage the pollution which was lead by smoke produced by the factories.

they had the law tat factories that produces smoke cannot be built near residential buildings.

building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

also they built water systems to provide water in those areas which are drought prone.