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Biology is the science of life. All living organisms share several key properties such as order, sensitivity or response to stimuli, reproduction, adaptation, growth and development, regulation, homeostasis, and energy processing. Living things are organised by a system that starts with cells, which make up tissue, tissue makes up organs, organs make up organs systems, and organ systems make up organisms. There is different organic molecules such as carbohydrates, proteins, lipids, and nucleic acids. Organic compounds contain carbon and are found in all living things. All cells are make up of organelles. The different types of cells are unicellular, multicellular, prokaryote, and eukaryote. The cell theory is, the cell is the basic unit of life, all organisms are composed of cells, all cells come from pre-existing cells.

Enzymes are special proteins that regulate nearly every biochemical reaction in the cell. Different reactions require different enzymes.

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