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cells basic building blocks of living organisms. all living things, no matter how large or how small they may be. tissues groups of cells that are specialized to carry out a particular function. organs groups of tissues that form a structural and functional unit within the body of a plant or animal. cell membrane the outer boundary of a living cell. it regulates what materials can enter and leave the cell nucleus spherical body that contains the genetic information of the cell and serves as a control center for the cell, directing and regulating its activities and controlling the process of cell reproduction cytoplasm the part of the cell between the nuclear membrane and the cell membrane. it may contain a variety of organelles, small, subcellular structures with specific functions reproduce, growth, composed of one or more cells, intake and expenditure of energy, adaptation, complex organization, respond to stimuli, homeostasis characteristics of living organisms