Question

The human eye has three types of cone cells. Damage to any one of the types of cone cells doesn’t cause total blindness because of the . A person who has a nonfunctional cone type won’t be able to identify the of objects.

Answer 1

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. 

Answer 2

I believe its  - other 2 functional cone cells and color