Invitation: “Give your reader a key they can follow.” Prepare: F1–F6; arrow-key aid. Selected opportunities: U02 / I04 / I06 / I08; conditional on actual component evidence, not blanket code completion.
Start with a choice · 5 minutes
Offer the learner their available model or a clean sheet if it is absent. Invite them to place/dictate F3 C→G or F6 G→L. They choose which documented relationship their explainer needs first. Do not reconstruct an absent previous product.
Read different plant parts · 8 minutes
Read F4 and F5. Contrast eucalypt leaves→caterpillars with eucalypt pollen/nectar/sap→glider and wattle sap→glider. Write resource parts beside a broad line. Ask: “Would a leaf label say what this source says?” It would misstate F4/F5. Both direct plant-resource and insect pathways can occur in the model; glider is not placed on one fixed trophic rung.
Make an arrow key · 12 minutes
Learners choose a drawing, two labelled objects/positions, or a spoken key. Include food/resource at the tail, consumer at the point, and transfer of some matter/chemical energy. Add a separate dashed sunlight→producer line only with “energy only”. One key component can be retained now, with a second later.
Use the key to repair · 15 minutes
Teacher puts a reversed C/G arrow on their own demonstration sheet. Learners trace the source and propose a repair. Then invite an actual check of one of their own arrows or a plan if no model is made. Do not call moving paper an animal-feeding observation. A line has no amount, population trend or automatic speed.
Try one reader question · 6 minutes
Learners answer “What does this arrow tell us, and what does it leave unknown?” by their chosen mode. Possible unknowns include how often feeding occurs or how much is eaten. If someone genuinely uses the key, capture that use only; imagined feedback is a plan.
Choose a clear version · 4 minutes
Invite one adjustment to label, line spacing or spoken order, with a scientific reason. Leave alternate valid representations open; no colour-only code or prescribed artistic design is required.
Practical check: Sample one actual source-connected choice/reason in the chosen mode. Use Day 22 routes, two worked contexts and home/extra invitation only as useful.