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Choose the colours that are easiest for you to distinguish. Applies to lesson diagrams and lab plots. Labels, shapes, hatching and line patterns also distinguish meanings. Source photographs and raw image brightness stay unchanged; mask-only views are available for image overlays.

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Use the ideas in new cases.

Four numerical questions, separate from the lesson practice checks. Opening the questions records exposure. Your first submitted answers are retained; up to two retries are practice.

This is a public, local objective check, not authenticated certification or human review. Passing checks the four supplied calculations, not every aspect of your reasoning. You can attempt it without completing earlier lessons.

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