Food is the most vital product of the agriculture sector. But there other non-food products critical to the economy generated in this multi-billion dollar industry, including cotton, wool and tobacco. Prior to the Great Depression, government subsidies to the agriculture sector were relatively limited.
Cell theory, first developed in 1839 by Matthias Jakob Schleiden and Theodor Schwann, states that all organisms are composed of one or more cells, that cells are the fundamental unit of structure and function in all living organisms, that all cells come from preexisting cells, and that all cells contain the hereditary information necessary for regulating cell functions and for transmitting information to the next generation of cells.
Cells are the basic building blocks of living things. The human body is composed of trillions of cells, all with their own specialised function. 1  Cells are the basic structures of all living organisms. 2  Cells provide structure for the body, take in nutrients from food and carry out important functions. Cells provide structure for the body, take in nutrients from food and carry out important functions. 2  Cells group together to form tissues, which in turn group together to form organs, such as the heart and brain.