Joe is from a baptist background. sarah is from a lutheran background. they are arguing about whether or not it is "right" to baptize infants into the christian faith. even though they disagree on infant baptism, their argument is based on their common belief that the christian faith is truth. this feature that underlies their argument illustrates what element of culture?

The answer is: Culture as shared ideas

Culture as a shared idea refers to a set of beliefs or behaviors that have similar characteristics  because it come from the same background.

In the example above, the similarities of beliefs that Joe and Sarah have come from the fact that they are both held a christian religion. The difference arise because the religion that they adopt are considered to be a sub-culture that derived from one main culture. (christian in the main culture, baptist and Lutheran are the sub-culture)

answer; environmental science;

i believe that's b. popular sovereignty