In order to manipulate sound without having direct contact with the strings of their instruments, pianists and harpsichordists use a <u>keyboard mechanism.</u>
<h3 /><h3>What does a keyboard mechanism do?</h3>
It act as an intermediary to allow for physical input to become output. This output will depend on the type of object the keyboard is in.
A keyboard on an instrument such as a piano, will convert the physical input of pianists into musical ouput by touching the strings of the piano.
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B) 60 because all you need to do is part / whole = degrees/360 so 7/42=degrees/360 then cross multiply and divide 7x360/42= 60 degrees
<u>ANSWER:</u>
The correct option is "The number of mice decreased".
<u>EXPLANATION:
</u>
It is clearly given in the question that the snakes depended on the mice for their survival. The snakes fed on the mice on the field. When the new method of grain spill was found, the mice could not find enough grain to eat and therefore they either left the field or died because of hunger.
`The reduced population of mice was not enough for the snakes which in turn either died or moved to another place for survival.
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