How are memories like lilies, according to the speaker of snow-bound?

The speaker of snow-bound view memory as something beautiful that he should alwyas hold into, which remind him about what he cherish in life.

This is very similar to lily who lay on top of ponds, who provide esthetical value and a place for others to hold on to.

"the day we found the sharks' teeth" i would say highlight the element of the plot as it sets its boundaries and centers the adventures of them being on a boat and cleaning spit of sand.

the answer is industry