Aweight lifter lifts a 380-n set of weights from ground level to a position over his head, a vertical distance of 2.25 m. how much work does the weight lifter do, assuming he moves the weights at constant speed?

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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.