Gene regulation is necessary in the development of multi-cellular organisms because it is necessary to make sure certain things go where they are needed to go. Multi-cellular organisms have more organ systems, therefore depend on more cells to live. Cells have a memory; the genes a cell expresses and the way it behaves depend on the cell's past, as well as its present environment.
It looks like it would be the 1st answer choice...
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Answer: The vertebral projection oriented in a median plane is called the spinous process
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Cells -> Tissues -> Organs -> Organs systems -> Organisms
