An environment provides water, food and shelter. A change can remove one of these. Effects differ between organisms. A danger is not proof that every organism dies. We will use an invented pond case, not observe a real pond. Safety: Paper work only; do not visit water or wildlife. Stop: Stop after all four steps, including both protection ideas and their missing facts. Do not inspect nests or move animals.

Materials: Paper; Pencil 1. Draw a pond with water plants, small fish and a tree used by nesting birds. Copy these illustrative case facts: drought makes the pond shallow; people remove the tree to build a path; fish need water; nesting birds need suitable nesting places. 2. Fold the paper into Natural change and Human-caused change. Place drought and tree removal in the correct halves. For each, draw an arrow from the change to a lost resource, then to a possible effect on an organism. 3. Add this case: rain returns before the pond dries fully. Explain why some fish might survive. Then add: the tree is removed while chicks cannot fly. Explain why the speed and timing of change matter. 4. Write one protection idea for each case and one fact you would need before claiming it would work. Use the given cases only. Done: The sheet has two sorted changes, two resource-effect chains, two timing explanations, two protection ideas and two missing facts. Proof: Keep the case sheet. Note whether an adult supplied a resource link, read the case, or wrote dictated words. Stop: Stop after all four steps, including both protection ideas and their missing facts. Do not inspect nests or move animals.