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"what varies" is a grammatically correct and usable phrase in written English.
It is typically used in a sentence to introduce or discuss the aspect or elements that are subject to change or variation. Example: "In this experiment, the independent variable is what varies and the dependent variable is what is measured."
Exact(21)
What varies more are the conditions under which the test is given.
What varies is the length of time they can keep up the pretence.
What varies is mostly the escalating gimmickry of the gadgets, the special effects and the sexiness of the actresses.
According to Charles, virtually all magic acts lean heavily on the same dozen or so basic effects — what varies is simply what magicians call the presentation — and almost all those effects were being produced in Victorian times.
Things which are relatively constant (such as the amount of sunlight, or access to good nutrition, the type of exams which are being set or access to antibiotics, say) might have a huge impact if they were changed, but the studies focus on what varies in the set of people being studied, not what is constant.
That includes how much income you have, figuring out your fixed costs (like your mortgage or rent, and making sure they are still feasible), how much you want or can continue to save for other financial goals and what varies month to month, items like dinners out and groceries.
Similar(36)
What varied was the patients' self-image.
With what varied meanings the word "pals" winds through Peter Whelan's 1982 play.
What varied from student to student was the frequency with which the action corresponded with a result.
It said most people would face similar changes in costs as inflation picks up, but what varied by age group was the extent to which income could keep pace with those costs.
The two classes had the same teacher for both years, but what varied, though only slightly, was the proportion of children on free school meals and who had come to us from other schools or as asylum seekers.
Write better and faster with AI suggestions while staying true to your unique style.
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