For every year of human resource consumption it will take Earth how many years to recover?

Compared to today where most Americans live until age 75, in 1900 the average life span was less than ___ years.

A) 55 B) 60 C) 50 D) 45

The conclusion from the experiment in which a chess master and a chess novice were asked to remember the positions of chess pieces on a chess board was that

a. chess masters outperform novices in all conditions. b. chess masters have developed better memory skills than novices. c. novices do better because they are not distracted by irrelevant knowledge about previous chess games. d. chess masters use chunking to help them remember actual game arrangements.