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

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

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

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

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