Bradbury did not create a believable story, as it has elements that are impossible to happen in reality.
"A Sound of Thunder" is a great work of science fiction and although Bradbury has created a very well-structured narrative, many elements are extremely unrealistic and impossible to be believable, which reinforces the fictional nature of the work, even if it presents real aspects.
The main unbelievable element is the possibility of traveling in time and causing changes in the past that modify the entire future.
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