The human eye has three types of cone cells. These cones respond to the light and its varying signals wavelengths determines how the brain will perceive the lights signals and determine the colors the person sees.
Damage to any one of the types of cone cells doesn't cause total blindness because they have independent structure and are parallel to each other. Instead, damage to any one of the types of cone may cause COLOR BLINDNESS.
Although recent studies suggest that posttraumatic stress disorder (PTSD) symptoms and pain may be related, the possible mediational role of depression in this relationship has not been examined. This study sought to examine this question in a sample of 130 male veterans seeking assessment or treatment for deployment-related PTSD. Results suggest that PTSD and pain are moderately related (r<span> = .29) but that this relationship is fully mediated by depression. Our findings have important clinical implications: Treatment of PTSD and pain in veteran populations should include careful assessment and regular monitoring of depression.</span>
Good government, resources and trade with other places, and employment options.
The answer is D) All of the above
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