Using the word work can you explain how a force like friction would cause the roller coaster to loose energy over time?

Here is the definition
Work is a done when a force (caused by energy) causes an object to move

10 is the . . .

Answer form flower;

It was crowded with sewer like smells. bad sewer systems

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.