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.
Tiny structures inside the cell called organelles work together to carry out all the cell's life functions. Learning the basic parts of the cell and their functions will help you understand how an animal cell works.hree Basic Parts of the Cell. The animal cell is made up of three basic parts: the cell membrane, the nucleus and protoplasm. Consider the cell membrane as the gatekeeper. It surrounds the cell contents and separates the cell from other cells and from the external environment.