Help In which of these sentences is a dash or dashes used correctly?

A. The geography of a writer's childhood is a part—a really important part—of the kind of writer he or she becomes.
B. The geography of a writer's childhood the place where he or she grew up—affects everything he or she writes.
C. The geography of a writer's childhood—affects the kind of writer and the kind of person he or she becomes.
D. The geography of a writer's childhood includes—not only physical details—but his or her feelings about them.

Biologists recognize five levels of cell organization. the lowest and simplest is the cellular level. organisms here are either unicellular organisms, like protozoa, or colonial organisms. colonial organisms are composed of single-celled individuals that stay together to sustain the life of the whole colony. next on the scale of complexity is the level occupied by tissue. a tissue is a group of similar cells which perform a similar activity. tissues that are organized around a common function together make up an organ, the third level of complexity. the fourth level of organization is the system, formed by a group of organs which together perform a specific bodily process. the fifth and highest level is the organism level, in which body systems work together in a structure capable of independent life. main idea: