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Ascaris Lumbricoides Life Cycle. Ascaris Lumbricoides, A Roundworm, Infects Humans Via The Fecal-Oral Route. The Most Common Way Of Childbirth Is A Vaginal Delivery. It Involves Three Stages Of Labour: The Shortening And Opening Of The Cervix During The First Stage, Descent And Birth Of The Baby During The Second Stage, And The Delivery Of The Placenta During The Third Stage.