The appearances of boys typically reflect the changes they have undergone since being on the island by the fact that they started out as British schoolboys, were neat, and looked nice.
Jack has degenerated from a superficially civilized schoolboy to a near-animal level. He yearns to kill, yet he too is learning the vast difference between imagining himself a hunter and actually killing a living creature.
According to the context of this question, the appearance of boys changes, because they have not kept up any personal hygiene habits, they have long hair, and long beards, and have not brushed their teeth since they have been on the island. Apart from this, they unbalanced their life randomly.
Therefore, the appearances of boys typically reflect the changes they have undergone since being on the island by the fact that they started out as British schoolboys, were neat, and looked nice.
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