Cell Structure and Compartments
An organism's first line of defense against attack by an invader such as a virus or bacterium is usually

its body wall
to flee or hide
a nonspecific immune response
a specific immune response

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Cell Structure and Compartments
Eukaryotic cells are more efficient than prokaryotes because their internal compartmentalization

makes each compartment nutritionally independent of all others
allows for specialization through merging of different tasks
allows for specialization through the subdivision of particular tasks
reduces overall cell size

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