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which of the following about "life without gravity" explains why it is an expository essay

Ait is a short work of nonfiction that does not express the writers opinion
Bit is a short work of nonfiction that use examples to make its points
Cit is a short work of nonfiction that explains something in an amusing way
Dit is a short work of nonfiction that explains a topic

in which sentence about life without gravity is the word spines used correctly

Ain microgravity astronaut's grow taller because their spins all over the walls
Bastronauts have to be careful drinking in microgravity or juice spines all over the walls
Cwhen astronauts bodies adjust to microgravity they can have fun floating on spines
Dastronauts use spines to exercise in space so they don't get too weak for life back on earth

PLZ HELP ME