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Which factor did Rosa Mabel Lee use to gauge the growth of fish?

Length of the tail
Number of fins
Color of the scales
Rings on their scales

Answer

The number of rings on fish scales can indicate their growth. As the fish grows, so do its scales, and new rings are added each year, much like the rings on a tree trunk. These rings provide a way to track the fish's growth over time and can reveal information about its age and overall health.