(a(i))[1]
State the name of the key type that offers paired feature choices.
(a(ii))[5]
Use the key to identify the birds in Fig. 1.1. Finish Table 1.1 by placing the letters A to F into the correct boxes.
(a(iii))[2]
State two features of birds, apart from the beak, that can be used to classify them as birds.
(b(i))[1]
State the genus of the avocet bird.
(b(ii))[2]
Calculate the percentage increase in avocet bird numbers.
(b(iii))[4]
Explain why organisms such as the avocet bird become endangered or extinct.