The Greeks have always been a part of Greece and it's history.
Yes / no, is the following a verifiable fact?
"The Greeks have an ancient history in Greece."
yes

John D. Rockefeller's main business was oil refining, he was in control of 90% of the oil in the United States.
Is the following sentence factually correct?
"John D. Rockefeller created his own fortune and became wealthiest American of all time."
Options:
- yes
- no
yes

The Hitchhiker's Guide to the Galaxy is a novel adaptation of a radio series, first published in the 1970s.
Is the following statement true?
"There are book, ebook, and audiobook versions available of The Hitchhiker's Guide to the Galaxy."
yes

Biogeography focuses on the relationship between biological/ecological processes and various bio-eco systems.
Yes / no, is the following a verifiable fact?
"Biogeography helps us understand how biological and ecological systems work."
yes