Plan a unit across several weeks

Plan a unit on {{unit_topic}} for {{learners}}, lasting {{unit_length}}. Plan backward from the end goal, so that every lesson moves students toward it and they have practiced everything the final assessment asks for before they take it.

End goal (what students should know and be able to do by the end, with any standards that apply):
"""
{{end_goal}}
"""

Final assessment, if decided: {{final_assessment}}

Resources, materials and technology available:
"""
{{resources}}
"""

Calendar constraints, such as holidays, testing days or assemblies: {{calendar}}

Format:
1. Overview: one or two essential questions, and three to five objectives that start with an observable verb (explain, compare, solve, write), not "understand".
2. Final assessment: what students do and which objectives each part covers. If none was given, propose one and label it "Proposed".
3. Lesson sequence: a table with the columns Week, Lesson, Objective, Key activity, Check for understanding. The number of lessons must match the calendar exactly, including one or two flex lessons for reteaching.
4. Checkpoints: at least one short check per week, each with what I will do if many students miss it.
5. Materials by week.
6. Differentiation: supports and extensions for the unit as a whole.

A good result builds each lesson on the one before, and teaches, practices and checks every objective before the final assessment. Keep each lesson to one row in the table; I will plan individual lessons separately.

Rules:
- Use only the resources listed.
- Mark any fact, date or figure that is not in the material I gave with "(check)" so I can verify it.
- Do not squeeze in more than fits. A topic students need several lessons to learn should get several lessons.

If there is more content than time, say so and suggest what to cut or combine. If the end goal is unclear, assume the most likely reading and state your assumption at the top.