In this problem take the speed of sound to be 343 m/s. How fast, in meters per second, does an observer need to approach a stationary sound source in order to observe a 1.4 % increase in the emitted frequency?

Ibelieve the answer is d. densityhope my answer has you : )

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.