The graph shows the history of the relative numbers of three varieties of bird \((X, Y\) and \(Z\) ) within a bird species, on a remote island in the Pacific Ocean.
The bird species arrived on the island in a migration event. Before migration, the bird species was not present on the island.
The graph record of bird numbers on the island is divided into two sections (1 and 2). Over the time data were recorded, the environment of the island did not change.
- What bird varieties originally migrated to the island? (1 mark)
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- Using the Darwin/Wallace theory of evolution, and making reference(s) to the data in the graph, explain the changes to the population of each variety of bird in
- section (1) of the graph. (2 marks)
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- section (2) of the graph. (4 marks)
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- section (1) of the graph. (2 marks)