( ( ( The ( reproductive cycle ) ) ( in ( female humans ) ) ) ( ( is ( known ( as ( the ( menstrual cycle ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ reproductive) (NN cycle)) (PP (IN in) (NP (JJ female) (NNS humans)))) (VP (VBZ is) (VP (VBN known) (PP (IN as) (NP (DT the) (JJ menstrual) (NN cycle))))) (. .)))
The reproductive cycle in female humans is known as the menstrual cycle.
(ROOT (S (NP (JJ Menstrual) (NN cycle)) (VP (VBZ is) (NP (NP (DT the) (NN name)) (PP (IN for) (NP (NP (DT a) (NN series)) (PP (IN of) (NP (NP (NNS changes)) (PP (IN in) (NP (NP (DT the) (JJ reproductive) (NN system)) (PP (IN of) (NP (JJ mature) (NNS females))))))))) (SBAR (WHNP (WDT that)) (S (VP (VBZ repeats) (NP (NP (DT every) (NN month)) (PP (IN on) (NP (NN average))))))))) (. .)))