The role of the cell membrane is most like the job of which person?

a. a firefighter who evacuates people from a burning building
b. a police officer who allows select people to enter and leave a crime scene
c. a bus driver who drives the express route from the suburb to downtown
d. a teacher who keeps students in the classroom during an exam

The cell membrane in humans and animals behaves most like the second option. A police officer who allows select people to enter and leave a crime scene. The cell membrane allows particles through to the cell that are vital for the cell to function, while keeping out unwanted substances.
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Ithink its because more have died recently than in the past.