The European eel, Anguilla anguilla, is a fish species. Although eels produce huge numbers of young, the size of eel populations usually stays fairly steady.
(a)[2]
Suggest two explanations for why eel population sizes usually stay fairly steady.
(b)[2]
Explain what the general theory of evolution means.
(c)[3]
Describe and explain the pattern shown in Fig. 1.1.
(d)[3]
Suggest and explain why the tuatara has changed very little over the last 200 million years.
Worked solution & mark scheme
This 10-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Loss due to predation or fishing” …