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Which part of the cell controls its activities and contains genetic material?
Plant cells have a cell wall, but animal cells do not.
The process of depositing a layer of one metal over another using electricity is called ___.
Pressure is defined as force per unit ___.
Which of these reduces friction?
Which of these microorganisms is used to make bread rise?
Diseases caused by microorganisms that can spread from an infected person to a healthy person are called ___.
Which of these is a major cause of air pollution?
The number of vibrations per second is called the ___ of a sound.
The loudness of a sound depends mainly on its ___.