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reason why option B is correct
contains 46 chromosomes of DNA in its nucleus

every is singular ..
contains is correct verb
and in its is correct pronoun
option B

Bunuel
Every healthy cell of the human body contains 46 chromosomes of DNA in their nuclei.

A. contains 46 chromosomes of DNA in their nuclei

B. contains 46 chromosomes of DNA in its nucleus

C. is known to contain 46 chromosomes of DNA in its nucleus

D. contains 46 DNA chromosomes in their nuclei

E. contain 46 chromosomes of DNA in its nucleus


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