A2.2 kg block rests on a frictionless wedge that has an inclination of 31◦ and an acceleration to the left such that the block remains stationary relative to the wedge; i. e., the block does not slide up or down the wedge. the acceleration of gravity is 9.81 m/s 2 .

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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.