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Use "frequencies" in a sentence
"From further back, the difference in frequencies is small and the effect less obvious."
"First, it does not distinguish random changes in frequencies in finite populations from changes that are"
"For example, while investigating how the chemical structure of the carotenoid pigments affects the determination of color, Kuhn showed how the backbone sequence of single and double-bound carbon atoms give the polyenes their light absorbing properties and how slight variations create important differences in frequencies of light that could be absorbed - i.e. the variant colors we observe."