This image depicts a cross section of the human eye. Which structure contains the highest concentration of cones? 
Definitions:
Documented
Information or events that have been recorded, written down, or otherwise preserved as evidence.
Plagiarism
The practice of taking someone else's work or ideas and passing them off as one's own.
Secondary Research
The process of synthesizing and analyzing information that has been collected previously by others, often found in published sources.
Copyright Infringement
The unauthorized use of copyrighted material without permission from the copyright holder.
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