Biology is the scientific study of life and living organisms. It encompasses a broad spectrum, from the molecular level, studying the basic building blocks of life such as DNA and proteins, to the cellular level, where these molecules come together to form cells, the basic units of life. It further extends to the study of tissues and organs, which are collections of similar cells performing specific functions, and organisms, which are complex structures comprising multiple organ systems. Biology also includes the study of populations of a species (population biology) and communities of different living species interacting with each other and their environment (ecology). It seeks to answer fundamental questions about the nature, mechanism, development, origin and evolution of living entities. The knowledge gained from studying biology is applied in many fields, including medicine, agriculture, and conservation.
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