Steve is trying to increase his average pace per mile by running hills. the hill on 1st avenue rise 3 vertical feet for each horizontal foot. the hill on 16th avenue rises 1 vertical foot for every 3 horizontal feet.

1st Avenue would be more difficult because it’s rise and run is for every one foot forward it is 3 feet up. Meanwhile avenue 16th would start at (3,1) and the rise and run would be for every 3 feet it would go up 1 foot.

The pieces can be represented by genes

Explanation:

It has been shown that the human genome contains more than 30 thousand protein‐coding genes, as well as transposable elements, repetitive and non-coding RNA sequences. These protein-coding genes are in turn composed of coding regions (exons) separated by non-coding regions (introns). The analysis of the human genome enables the scientists to identify genes associated with specific signaling network pathways  and diseases.