Question

based of a picture of the bone structure of a human and a fin.
answer the following question using the CER format.
How does this picture show evidence of evolution?

Claim: 1-2 sentences: clearly state your main recommendation or conclusion. it should be concise and directly address that prompt or question
Evidence: 1-2 sentences: provide specific data, facts, or research findings from a source that support your claim. this section should include relevant information or examples that backup your claim.
Reasoning: 1-2 sentences: Explain how the evidence supports the claim. Discuss the connection between the evidence and the claim, and why the evidence is relevant and convincing

Answer 1

**Claim:** The comparison of the bone structure of a human and a fin demonstrates evidence of evolution by highlighting the similarities in their underlying skeletal architecture, suggesting a common ancestor.

**Evidence:** Research in comparative anatomy shows that the forelimbs of tetrapods, such as humans, and the fins of fish exhibit homologous structures, where the same set of bones—such as the humerus, radius, and ulna in humans—are adapted for different functions in aquatic and terrestrial environments.

**Reasoning:** This similarity in bone structure supports the claim of common ancestry because it indicates that these diverse forms arose from a shared evolutionary origin, undergoing modifications due to environmental pressures and functional adaptations over time. The presence of homologous structures is a critical piece of evidence that illustrates the process of evolution through descent with modification.