Answer:
Tom has a crippled left arm that couldn't have inflicted Mayella's specific injuries (additionally, Bob Ewell is left-handed); Mayella's story changes throughout the trial and suggests that it is fabricated; and whereas Tom had no apparent motive for the accused crime, Bob Ewell had an identifiable motive for the assault, seeing as Mayella broke the strict social code of the prejudiced South by kissing Tom.
Step-by-step explanation:
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