Task: Sentence Ordering
Input (English): Steps: (1) A man and woman mate (2) Embryo is C (3) Embryo grows and develops into a fetus inside the woman&#x27;s womb (4) The fetus is born (5) Begins to grow and develop through infancy and childhood (6) In the teenage years the human experiences puberty (7) At 18 the human becomes an adult (8) Adult may procreate continuing the cycle.  
Where does the following step fit into the given list of steps: Reaches sexual maturity 
Output (English):  After step 6.