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Discover LudwigSuggestions(5)
The phrase "are the ultimate source" is correct and usable in written English.
It can be used when discussing the origin or primary provider of information, resources, or authority on a particular subject.
Example: "In the context of historical research, primary documents are the ultimate source of information."
Alternatives: "are the primary source" or "constitute the main source."
Exact(38)
Mr. Pirie noted that leaves are the ultimate source of protein.
They are the ultimate source of our society's strength or weakness.
But what creates these network effects, which are the ultimate source of much of the company's value?
Plants are the ultimate source of nutrients in the human diet.
Nevertheless, the number of interactions and the associated network effects are the ultimate source of competitive advantage.
Photons radiated by the Sun are the ultimate source of energy for driving energy-dependent reactions in living organisms.
Similar(22)
This argument also is over what qualities the country needs in a leader and what are the ultimate sources of wisdom.
Most exponents of individualist approaches would nonetheless maintain that individual decision makers within organizations or states are the ultimate sources of agency.
Witchdoctors may not be the ultimate source of the problem, she added.
On the contrary, it is the ultimate source of all things; it is pure being (benti).
Some constitutional or statutory provision is the ultimate source of all actions by state officials.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com