Fisher Chemical™ Optima™ LC/MS grade solvents, reagents, and mobile phase blends set the standard for consistent, reproducible performance. Extensive testing shows minimal metal impurities, low background noise, and the lowest impurity background using diode array detection.
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Here are thousands of instances of "our life is short", and I seriously doubt many of them are specific to the lives of, say, a couple living together. It's perfectly normal to refer to human lives collectively in the singular.
When to use "lives" as a plural of life? - English Language & Usage ...
A plural subject requires a plural object (lives), accordingly a singular subject requires a singular object (life). They can be used to mean one person or several people, however. So, if your intention is to refer to an individual who lost his or her life whilst saving the lives of more than one others, then the second is correct and the first incorrect. They is singular in this context, so ...