Figure 4 is a map of the Galapagos Islands. On Isabela Island, the medium ground finch and the small ground finch are found. On Daphne Island, only the medium ground finch is found. On Crossman Island, only the small ground finch is found. Figure 5 shows how the beak depth of each species varies on each island. The medium ground finch and the small ground finch both feed on seeds. The size of seeds eaten by each bird depends on the depth of the bird’s beak. The range of beak depth of medium ground finches on Isabela Island is different from the range on Daphne Island. Explain what might have caused this difference – 7076

One thought on “Figure 4 is a map of the Galapagos Islands. On Isabela Island, the medium ground finch and the small ground finch are found. On Daphne Island, only the medium ground finch is found. On Crossman Island, only the small ground finch is found. Figure 5 shows how the beak depth of each species varies on each island. The medium ground finch and the small ground finch both feed on seeds. The size of seeds eaten by each bird depends on the depth of the bird’s beak. The range of beak depth of medium ground finches on Isabela Island is different from the range on Daphne Island. Explain what might have caused this difference – 7076”

1. Birds that arrived on Isabela had different beak sizes.
   This was due to different genes or mutations.
   Isabela had a wide variety of seeds, including larger seeds.
   There was more competition for food.
   Birds with larger beaks could eat the big seeds and survived better.
   These birds reproduced and passed on their beneficial alleles (genes) to their offspring.

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