01. The author of Passage 1 thinks that Stonehenge was an observatory, while the author of Passage 2 thinks that Stonehenge was a holy site.
02. The author of Passage 1 thinks Stonehenge was built by prehistoric humans, while the author of Passage 2 thinks that Stonehenge
was built by the Celts in about 750 BC.
O 3. The author of Passage 1 thinks that the stones of Stonehenge were dragged over land, while the author of Passage 2 thinks the
stones were transported by glaciers or through water.
4. The author of Passage 1 thinks that the Heel Stone of Stonehenge had an astronomical purpose, while the author of Passage 2
thinks that the Heel Stone served as a tombstone in a burial ground.

Explanation:

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the purpose of the heading in the passage is to identify who is telling the story.

this excerpt is part of the book sugar changed the world (2010) written by marc aronson and marina budhos. as the book has been written by two people, the heading "marc" indicates that this specific excerpt is being narrated by aronson. in the fragment, marc describes his grandfather's story after hearing it from his cousin. however, there are other excerpts where budhos is the one that tells the story of her family.

aronson and budhos, who are husband and wife in real life, decided to write sugar changed the world when they found out how sugar, which had an important role in slavery and economy, changed their ancestors' lives.