The document is a GCSE (9–1) Combined Science (Biology) A past paper, covering essential biology topics. Key areas include cellular and molecular biology (genes, chromosomes, inheritance), ecosystems (carbon cycle, abiotic factors), human biology (HIV, TB, cancer), and practical investigations (population sampling, genetic crosses). It examines scientific principles such as natural selection, selective breeding, and gene therapy, along with data interpretation and experimental design. Questions range from multiple-choice to extended responses, encouraging analytical skills and application of biological knowledge in real-world contexts.