(a(i))[1]
State the role of human teeth.
(a(ii))[1]
State the name of the visible outer covering of the teeth.
(a(iii))[3]
Explain how tooth decay develops in humans.
(b(i))[4]
Use the key to work out the species shown in Fig. 1.2. Write the letter for each species (A to G) in the matching box in the key.
(b(ii))[2]
State two internal features you would expect to find in a killer whale, but not in a fish.
(b(iii))[1]
State the name of the animal group that includes mammals and fish.