A musical instrument is a instrument that can make music. There are 4 classfations for each insutremnt: brass, percussion, woodwinds, and strings. Instruments can have different clefs like a treble clef and a bass clef what a piano and a harp has. Instruments can make sounds by blowing into them, to strike them, to hold a bow onto its strings, so if them the hit them like drums, and some musical instrument make electricity to make sounds like a electric guitar for example. There are lots of world instruments and many other types of it too.
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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