Seals use their forelimbs as flippers for swimming. Bears use their forelimbs for walking. From the outside, the two forelimbs look very different.
Which observation is evidence that seals and bears evolved from a common ancestor?
Each forelimb is well suited to the environment in which the animal lives.
Both forelimbs contain one upper bone, two lower bones, wrist bones and five digits.
Both forelimbs are used to move the animal's body from one place to another.
The seal's forelimb bones differ in length and shape from the bear's forelimb bones.
85 exam-style questions on Edexcel GCSE Biology 4.1 Evolution and natural selection, covering 4.1.1 Work of Darwin and Wallace and 4.1.2 Resistant organisms and evolution. Each one has a worked solution and a mark scheme showing where the marks go.