Final answer:
Laura Esquivel warns her daughter not to step on a kernel of corn due to the sacred and vital role corn plays in Mexican and Latin American culture.
Explanation:
Laura Esquivel warns her daughter not to step on a kernel of corn because the story of maize being the mother of man is a myth deeply rooted in Mexican and Latin American culture. Corn is seen as a sacred and life-sustaining entity, so stepping on a kernel could be seen as disrespectful or harmful to the source of sustenance.
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