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Under President Obama, online petitions submitted to the White House had to receive ________ signatures to be reviewed and commented on by the administration.
Receptor Cells
Specialized cells that detect and respond to physical or chemical stimuli, converting them into electrical signals.
Cones
Photoreceptor cells in the retina of the eye responsible for color vision and functioning best in bright light.
Fovea
A small depression in the retina of the eye where visual acuity is highest due to the concentration of cones.
Peripheral Vision
The part of vision that occurs outside the very center of gaze, allowing for the detection of stimuli through the sides of the eyes.
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