How did the jungle show that the meatpacking industry needed to be regulated?

By showing that the meatpacking industry did not have high standards of safety and cleanliness

Explanation:

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The Jungle revealed the poor standards of hygiene in the meatpacking industry. It revealed that the meatpacking industry did not observe high standards of cleanliness and safety. This resulted in Congress passing legislation to regulate meatpacking in order to safeguard the health of Americans