(a(i))[2]
Name the structures labelled L and M. Record your answers on Fig. 8.1.
(a(ii))[2]
Urea is excreted in the urine. Name the organ that produces urea and suggest how urea is carried to the kidneys.
(b)[3]
Suggest three possible reasons for the smaller volume of urine produced by the student on day 5.
(c)[3]
Outline three processes used in sewage treatment to make the water it contains safe for human use.