Basic General Knowledge
To produce sound it is necessary that

the source should execute longitudinal vibrations
the vibrations of source are not necessary
the source may execute any type of vibrations
the source should execute transverse vibrations

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Basic General Knowledge
The Rh factor refers to

a process that speeds up the clothing of blood
the ratio of red corpuscles to white corpuscles in the blood
a protein substance found in the blood of some people
a hormone carried by the blood

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