Why does the story start with the father and son playing chess? Does the father’s strategy at the chess game tell you anything about his personality? If so, what?

a polymer is a chainlike molecule made up of small molecular units. these small molecular units are called monomers. monomers of polymer can be joined together either naturally or synthetically.  

coal is not sustainable because it will one day run out.

primary succession begins with a bare rock and ends with a forest secondary succession begins after a natural disaster where there is a temporary setback after a forest fire or local destruction, but the surrounding area can fill in