Given the task definition and input, reply with output. Given a list of steps and an additional step, determine where the step fits into the original list of steps. A correct answer, correctly places the given step into the set of steps so that it creates a new plausible set of steps. Output must be formatted as 'After step n', where n is the step number after which the given additional step is to be inserted.

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 

 After step 6. 