Getting students to write scientifically can feel like pulling teeth, especially when they struggle to move beyond surface-level answers. This CER science writing prompt on natural selection gives middle schoolers a structured, engaging way to practice constructing evidence-based explanations. Students respond to the question: "How does the fur color of the mice affect their chances of survival and reproduction in this environment?"

📋 WHAT'S INCLUDED

• 3 student-facing CER prompt versions focused on natural selection
• 3 answer keys with sample responses for teacher reference
• 1 rubric for consistent, easy scoring
• Built-in sentence starters and a graphic organizer for scaffolded support across all learner levels

💛 WHY YOU'LL LOVE IT

This prompt is ready to use the moment you download it, with zero prep required. The built-in scaffolds make it accessible for struggling writers while still challenging advanced students to think deeply. It aligns directly with NGSS MS-LS4-4, so you can use it confidently as a formative assessment, exit ticket, or science journal entry. Students walk away with stronger scientific writing and critical thinking skills that they can apply across all of life science.

📄 FILE FORMAT

This resource is included as a PDF file.

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