From what the first three stated and from a little research, I think it may be the combination of the three which is HUMAN CIVILIZATION. Because,
from what i have read in on this page and from analysis, it is a very essential compound for the start of a human civilization.
And according to that link, “chalk” is composed of calcium carbonate and used in writing 10,000 years ago. Well, writing IS a form of communication and thus increases the chances of survival and thus “realize it is major spoilers” and thus, evolution of stone age to modern age. That is what i had in mind.