If we had tens of thousands of skeletons distributed at regular intervals through the historical record, there would be appreciably more degrees of shading.
My fingers stumbled over the keypad, making mistakes. I had to hang up and start again. I concentrated only on the buttons this time, carefully pressing each one in turn.
In that order, you want to make sure that you clearly separate your problems and your solutions and that your solutions make sense for the problems that you discuss in your essay.
Believe it or not, there was a time when some thought this was how human speech worked; That our brains picked words one by one in order, deciding what word was most likely to follow the one before.