The wood use to. make chairs and musical instruments is made up of which plant tissue

Xylem tissue  

Explanation:

The wood used to make chairs and musical instruments is made up of xylem plant tissue. Xylem tissue is a complex tissue that is made up of four primary cell types which include; xylem fibre, xylem parenchyma, trachea and tracheids. The xylem tissue together with phloem conducts water and solutes from the leaves to the other parts of the plant. Xylem tissue exists in both primary and secondary vascular tissues. The secondary xylem makes the mature stem and root in woody plants and it is produced as the plant develops in girths. The inner part of a large tree (known as heartwood) is made up of primary xylem that are dead but structurally strong, while within the older branches and the trunk of the tree is the external secondary xylem (known as sapwood) which functions by conducting water.

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.