Answer:
John L. Sullivan is an icon or a legend in the world of heavy weight boxing. He was known as "Boston Strong Boy" but found later in his career to becoming addicted to alcohol and to selling alcoholic beverages (prohibition). Later on in his retirement, he had become an actor, speaker, and a prohibition lecturer.
Explanation:
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1)hormone.2)reduce the use of chemical that destroy ozone and 3)digestive
The answer is secondary source because the historian may be an expert but he would have to be present in the event/topic to be considered a primary source. Another example of secondary source is history books because they detail events accurately but the books are not from when the event occurred.