(a(i))[4]
Identify the processes labelled A to D in Fig. 2.1.
(a(ii))[3]
Describe the process taking place at E in Fig. 2.1.
(b(i))[1]
State which location has the greatest number of animals present.
(b(ii))[3]
Suggest which animal species is unable to survive in polluted water. Give reasons for your choice.
(b(iii))[1]
Suggest which animal species in Table 2.1 shows that the water is polluted when it is present.
(b(iv))[3]
Calculate the percentage change in the freshwater shrimp numbers from location 2 to location 3. Give your answer to one decimal place.