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Build a strong, integrated introduction to biology by learning core vocabulary and the cause–effect logic that connects biochemistry, cells, genes, evolution, and ecosystems. Focus on how science generates and tests explanations through hypotheses, experimental design (controls, independent/dependent variables), and evidence-based interpretation. Develop quantitative comfort with simple graphs, proportions, and frequency reasoning (including Hardy–Weinberg). Master key structure–function themes (macromolecules, enzymes, membranes, organelles), information flow (DNA→RNA→protein, mutations), energy transformations (ATP, respiration), inheritance (meiosis, Mendelian patterns), evolutionary mechanisms, and ecological energy flow and interactions.