Diffusion: Revision Notes
Diffusion is the movement of a substance from an area of high concentration to an area of lower concentration. Diffusion occurs in liquids and gases when their particles collide randomly and spread out.
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Cancer
Cancer develops due to abnormal cell growth and the division of cells. These cellular modifications result in a solid mass (tumour) made up of these abnormal cells. It's important to note that not all tumours are cancerous, they can either be benign or malignant.