changes in acceleration:unbalanced forces:::balanced force a no changs in acceleration b gravity c stretched rubber band d friction

Wavelength divides in half and speed stays the same.

Your answer is 120miles 

Answerthe distance between the two ends of the galaxy is 150,000 light years;

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.