The body must maintain a stable internal environment (Homeostasis) and respond to stimuli.
[ \textCarbon dioxide + Water \xrightarrow[\textchlorophyll]\textlight \textGlucose + Oxygen ] [ 6CO₂ + 6H₂O \rightarrow C₆H₁₂O₆ + 6O₂ ]
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The release of energy from food substances in all living cells.
Aerobic Respiration: (Uses Oxygen)
Anaerobic Respiration: (No Oxygen)
The Cambridge O Level Biology (5090) course covers fundamental biological concepts required for understanding living organisms, their structure, functions, interactions, and applications. This article organizes key topics, concise explanations, diagrams to sketch, common practical skills, exam tips, and a revision plan tailored for high scores.