a comet struck and a chain of problems happened which wiped yhe dinosaurs out
<span>A central or a main idea is an idea around which your entire paper or essay or paragraph or whatever it is you're writing, revolves. You have a central idea that you're trying to convey and everything you write or say somehow relates to that idea and proves a point that you're trying to make.</span>
I'd go with the flaws of human nature and the inability to perfect the world around us (aka nature)
