Why couldn't one single dichotomous key be used for all of the organisms on earth answer

What is the main difference between hearing and listening? a) hearing is easy; listening is hard. b) hearing involves the outer ear; listening involves the inner ear. c) hearing is the physical activity; listening involves processing the information. d) none of the above

Why does the author of lifeboat ethics choose to begin his essay with this lifeboat metaphor

I’m shakespeare’s plays lower class characters often speak in a.blank verse b.free verse c.purple prose d.prose