Final answer:
Young children are at high risk of ingesting poisonous substances such as lead, which can lead to severe health issues.
Explanation:
Young children are at greatest risk for ingesting poisonous substances due to their physiological differences and behaviors that increase exposure. For example, they may ingest lead from chipped paint or contaminated soil, leading to lead toxicity and lead poisoning. Children under age six, with their frequent hand-to-mouth behavior, are particularly vulnerable to such exposures.
Learn more about Children's health risks from ingesting poisonous substances here:
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