Do you think there is at least one element that all belief system have in common if so what is it

Choose the word that completes the palindrome below. madam, i'm pop elba adam panama put up

In e. c. tolman's experiment, some rats were trained to run through mazes for standard food goals, while other rats were allowed to explore the mazes for 10 days without food goals or other rewards. later, when food rewards were placed in a box at the far end of the maze, the previously unrewarded rats reached the food box as quickly as the rewarded rats after only one or two trials. this experiment demonstrated that the rats had the ability to form of their surroundings.

How have people adapted physically to different environments? why do you think these differences developed?