Why is the shape of the sickled cells an issue answer

The reason they have a sickled shape is that the underlying gene has the wrong instructions. These misshapen blood cells get clogged in vessels and don't have the life expectancy of normal blood cells. A person with sickle cell disease will experience fatigue (feeling tired) and have episodes of extreme pain, called a pain crisis. Sickled blood cells that block vessels in the brain can even cause a stroke.

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"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.

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