Wiktionary
fluctuates
vb. (en-third-person singular of: fluctuate)
Usage examples of "fluctuates".
A second problem in radiocarbon dating is that the carbon 14/carbon 12 ratio of the atmosphere is in fact not rigidly constant but fluctuates slightly with time, so calculations of radiocarbon dates based on the assumption of a constant ratio are subject to small systematic errors.
In addition, receptivity to innovation fluctuates in time within the same region.
A fox can maintain its internal temperature relatively independently of changing weather, whereas a rock's temperature fluctuates immediately with every passing circumstance.
And the Earth’s climate fluctuates on longer cycles—Ice Ages come and go—and that’s all mixed in too.