Data for selected fruits purchased at wholesale prices for 2005 and 2009 are shown next. 
What is the simple price relative for navel oranges?
Definitions:
Santiago Ramón y Cajal
A Spanish neuroscientist known for his pioneering work in neuroanatomy, specifically his detailed drawings of neurons.
Growth Cones
Dynamic, actin-supported extensions of a developing or regenerating neurite seeking its synaptic target.
Glial Cells
Cells within the central and peripheral nervous system, not of neuronal origin, that offer both support and protection to neurons.
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