Refer to the figure showing the initial stage of double fertilization. 
Identify the cell(s) of the embryo sac or pollen tube that do(es) not participate in double fertilization.
Definitions:
Protect
To keep safe from harm or injury; to guard or defend from danger or risk.
Maintain Shape
The ability of an object or material to preserve its configuration or form under stress or after manipulation.
Cones
Photoreceptor cells in the retina of the eye that are responsible for color vision and function best in relatively bright light.
Color Blind
A condition where an individual has difficulty distinguishing between certain colors, often genetic in nature.
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