Match the items of Column I with the items of Column II with reference to sewage.
Column I |
Column II |
(a) Inorganic impurities |
(i) Phosphorus and nitrogen |
(b) Organic impurities |
(ii) nitrates and phosphates |
(c) Nutrients |
(iii) cholera and typhoid |
(d) bacteria |
(iv) pesticides and herbicides |