Basic General Knowledge
The Rh factor refers to

a hormone carried by the blood
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

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Basic General Knowledge
To produce sound it is necessary that

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

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