When an object in translational motion moves in a straight line, it is said to be in rectilinear motion. ... When an object in translational motion moves along a curved path, it is said to be in curvilinear motion. 2. Examples are a car moving on a straight road and a train moving on a straight track.

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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.