Final answer:
The Claim-Evidence-Reasoning (CER) writing framework's key feature is that students must provide a claim, evidence, and reasoning to construct coherent and logical arguments.
Step-by-step explanation:
The key feature of the Claim-Evidence-Reasoning (CER) writing framework is that students provide their claim, evidence, and reasoning. This structure helps students to construct coherent arguments by making a claim, backing it with evidence, and explaining how the evidence supports the claim. It encourages critical thinking, logical analysis, and clear writing. The framework is not about adding new vocabulary, writing in a narrative format, or using persuasive language, although persuasive language may often be used within the reasoning component to convince the reader of the claim's validity.