Solomon asch did a series of studies on conformity and the pressure behind it. he found three independent variables that contributed to the study. which of the following was not one of the variables asch found?

Which of the following must be true for a fossil organism to be useful as an index fossil? a. the fossil organism must be widespread geographically. b. the fossil organism must be abundant. c. the fossil organism must be limited to a short span of geologic time. d. all of the above.