Answer: A. the lens focuses light on the retina 
The lens is composed of transparent, flexible tissue and is located directly  behind the iris and the pupil. it is the secondary part of the eye after the cornea. by changing it's shape the lens changes the focal distance of the eye and focuses the light that passes through it and into the retina in order to create clear images of objects. it also works together with the cornea to refract, or bend light.
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Plant cells have a cell wall. They also have a larger water vacuole.
 
        
             
        
        
        
Answer:
Populations will decline.
Explanation:
Since individuals will be less likely to successfully reproduce, and because they will not be able to breed with other birds on the breeding grounds.
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<span>Nevadan, Sevier, Laramide. </span>