Which of the following is an example of an externality: a) A long line of people at an afternoon matinee at the movie theater. b) A flood wipes out a farmer's entire corn crop. c) A student sells his/her economics textbook after failing the class. d) A student voluntarily asks a question during class.

the period of human evolution has coincided with environmental change, including ('hominin' refers to any bipedal species closely related to humans – that is, on how do we know earth's climate has changed? a map showing dates and locations of prehistoric archeological sites and migration routes from africa into.

answer; caravan;

an important point to remember about correlation is that while there is a _statistical_ relationship correlation does not equal _causation_

the first answer is: statistical

the second answer is: causation