The recorder is a woodwind musical instrument in the group known as internal duct flutes—flutes with a whistle mouthpiece. A recorder can be distinguished from other duct flutes by the presence of a thumb-hole for the upper hand and seven finger-holes: three for the upper hand and four for the lower.
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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