The operator of a mass spectrometer produces a beam of singly ionized argon atoms.
They are accelerated by a potential difference of 40.0 V and are passed through a magnetic field of 0.080 T. The operator finds that the radius of the beam is 72 mm. What is the mass of the argon atom?

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How is it possible that phylogenies based on sequences from nuclear genomes and organellar genomes (i.e., chloroplasts and mitochondria) from the same group of species yield phylogenetic trees with different branching orders?   answer :   the genome of the endosymbiont is more closely related to members of the group in which it originally evolved, while the nuclear genome of the engulfing organism has its own evolutionary trajectory.

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