Photo AI
Figure 14 shows the limbs of some animals - Edexcel - GCSE Biology - Question 7 - 2021 - Paper 1
Question 7
Figure 14 shows the limbs of some animals. Describe how these limbs provide evidence for evolution.
Worked Solution & Example Answer:Figure 14 shows the limbs of some animals - Edexcel - GCSE Biology - Question 7 - 2021 - Paper 1
Step 1
They have a similar arrangement of bones / five digits / pentadactyl limb
Answer
The limbs of the man, cow, horse, whale, and bird exhibit a similar bone structure, indicating they share a common structural framework. This pentadactyl limb is a characteristic feature in many vertebrates, suggesting that these different species have evolved from a common ancestor that possessed a similar limb structure.
Step 2
Evolved from a common ancestor
Answer
The similarity in limb structure among these diverse animals indicates that they likely evolved from a common ancestor. This shared evolutionary lineage supports the idea of descent with modification, where different species adapt their limbs over time to suit their specific environments and functions.