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Build one timed lesson around a measurable objective, an active learning task, and an exit ticket that reveals the next teaching step.
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Translate assignment requirements into weighted criteria and concrete performance levels that instructors can review before grading.
**Explanation** Every cell is wrapped in a thin boundary called the cell membrane. It is not a solid wall — it is more like a flexible skin with tiny gaps and doorways in it. Some things slip through those gaps on their own, and other things are too big or the wrong shape and have to be let in deliberately. That difference is the whole idea: the membrane decides what gets in and out, which is how a cell stays different on the inside from the water around it. Diffusion is the name for the "slip
Turns a topic and a class profile into a plain two-paragraph explanation, two worked examples and one analogy, then invites you to revise it around your students' misconceptions.