The number and frequency of the search planes are diminishing as they got mixed with the surroundings of the environment.
The novel was written by an American author named Lois Lowry in the year 1993.
In the novel named The Giver, when Jonas and Gabriel are traveling at night, they are not able to see the search planes. The search planes got blended in with the surroundings around them.
Therefore, the mixing of search planes in the environment is the reason for the diminishing of the number and frequency of it.
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