Answer: Thomas Malthus, who studied population growth.
Thomas Malthus was an English scholar. He is particularly well-known because of his studies on population growth. He realized that, when food production in a nation improved, population tended to go up. However, this change did not last long, as population growth restored the original per capita production level. Therefore, instead of using surplus for improving standards of living, humans tend to use it to increase population. These conclusions were carefully studied by Darwin, and they helped him develop his own theories on natural selection.
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Sorry, I'm not sure about 15 but I hope this helps.
It means unclear or unknown
Well, you're going to talk about the conflicts in The Lottery and The Lady or the Tiger... So... in The Lottery, the main conflict was that the lady (whatever her name was) was chosen to be stoned in the lottery. It wasn't really resolved in anyway, except that she got.. stoned. I haven't read The Lady or the Tiger, but you would do the same thing for that. Then you would state the theme, or moral, or main point, of each story. And then you would compare how the resolutions for both conflicts demonstrate the stories' themes.. Does it make a bit more sense?