The document discusses several topics related to biology including evolution theory, endangered species, fossils, human influence on the environment, pollution, and nutrient cycles. It provides background on natural selection, mutations, fossil evidence for evolution, and examples of endangered and extinct species. It also examines human impacts such as pollution, deforestation, and intensive farming as well as potential solutions. Finally, it outlines the carbon and nitrogen cycles and key processes involved in nutrient recycling in ecosystems.

1. Biology Revision

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27. Feeding Decomposers Death but no decay Death and Decay Photosynthesis Burning and Combustion Respiration The atmosphere Fossil Fuels Back to Contents

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