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International Baccalaureate (IB) HL & SL Biology  Topic 1: Cell Biology IB Biology Essential Idea The evolution of multicellular organisms allowed cell specialisation and cell replacementThe cell theory According to cell theory, living organisms are composed of cells The topic 1 of International Baccalaureate (IB) SL & HL Biology starts with Cell Theory....

The following article will explain the timeline of the changing models of atom and the current model of the atomic structure. The students have started new specifications of OCR AS Chemistry A (H034),AQA AS Chemistry (7404),Edexcel AS Chemistry (8CH0) and CIE AS/A-level Chemistry (9701). All specifications require fundamental understanding of the changing models...

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