The OCR GCSE Biology Paper 2 (June 2019) explores homeostasis, evolution, and environmental biology. Key topics include thermoregulation, the carbon cycle, plastic pollution, and food webs. Practical investigations cover starch testing in leaves, light response in plants, and photosynthesis rates in pondweed. The paper highlights genetic inheritance, the role of hormones, and human impacts on ecosystems. Ethical considerations and scientific inquiry are emphasized, integrating real-world applications like plastic degradation by bacteria and evidence for evolution through fossils. Experimental methods, data analysis, and problem-solving skills are central to this exam.