The graph below shows changing testosterone levels in male and female humans from before birth until old-age. Note that the scale on the x-axis is not evenly distributed.
Compare and contrast the changes in testosterone levels for males and females.
Label the graph in part a) with an X at roughly the point at which puberty begins in males.
State two physiological changes that would occur in males at the point you have marked X on the graph in part a).
Did this page help you?