Which word signals a cause?
so
then since
therefore

Why did ponyboy fool around instead of shooting when hunting with his father? why did pony not tell dally? how do you think this shows ponyboy's character as being different from dally?

"the trouble is," sighed the doctor, grasping her meaning intuitively, "that youth is given up to illusions. it seems to be a provision of nature; a decoy to secure mothers for the race. and nature takes no account of moral consequences, of arbitrary conditions which we create, and which we feel obliged to maintain at any cost." what larger idea is the doctor referring to when he says that nature takes no account of moral consequences? impulses often overrule a person’s sense of good and bad. nature forces women into motherhood. young people are prone to having delusions. morals play no role when we choose who we love.

How to combine the two sentences in bold.