The phrase "may vary" is correct and usable in written English. It is used to indicate that something can change depending on a number of different factors. For example, "The cost of the item may vary depending on the size and color."
Within plants, there is more than a 2000-fold varintion in GS [4], which may varies considerably even between very closely related species.
The use of local Leptospira isolation may improve the sensitivity and specificity of the test because it may varies from one geographical region to another region.
We conclude that the concept of sentinel species must be carefully validated as the actual nature of exposure may varies between human and wild species as well as the vulnerable time period of exposure and various ecological factors.
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Awesome tool! I started using it one year ago and I never had to look for another app
Ha Thuy Vy
MA of Applied Linguistic, Maquarie University, Australia