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1) The teacher introduced the topic of cells by asking the students if they knew about cells and microscopes. The students responded that they had some prior knowledge about different body parts from their previous lessons. 2) The teacher then explained the four main types of cells - epithelial cells, connective tissues, muscle cells, and nerve cells - and their functions. The students participated actively by answering questions about each cell type. 3) To conclude, the teacher summarized that cells are a group of tissues that work together and make up living organisms. The students demonstrated their understanding of the key concepts about cells.