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Microbiology › View

The greatest number of pathogens enter the body through the ______.

A. Skin

B. Respiratory System

C. Urinary System

D. Gastrointestinal system

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Mutations, Replication, and Cancer › View

The Hayflick limit involves

A. the size a cell can reach before dividing

B. a cell dividing about 50 times before it goes into apoptosis

C. telomeres lengthening with each cell division

D. None of the choices

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