An electric guitar is a guitar that uses one or more pickups to convert the vibration of its strings into electrical signals. ... During the 1950s and 1960s, the electric guitar became the most important instrument in popular music.

So, the cell theory states that living things consist of cells, that a cell is the basic structural and function the unit of life. And they are all cells come from pre-existing cells. So, scientist have been study living things for over 400 years. Later, the development of the microscope allows scientist to see cells for the first time because, it was hard to see. So, they can develop the cell theory by basic characteristics, of living things. You have to learn cells from other living things because, you have to learn what is the cell is look like, of its size or complexity. And it reminds us of studying of how living things work.
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