Why do hot spring in Yellowstone national park have wooden walkways built around them

You can imagine what would happen if 10,000 people a week were walking over these fragile hot-spring deposits. “The boardwalks are an amazing piece of construction that's a useful tool for resource protection, and visitor enjoyment and safety.

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small, big, or no change could occur in the phenotype. it could cause something as simple as a cats ears to curl backwards or something as frighting as death. it could also occur in the protien-coding area and have an effect on that but no effect on the amino acids. what has to occur is a changing in the hox gene or the control gene.