Why might an economist think that some jobs categorized as quatemary sector jobs could be included in the tertiary sector?

2/6 of be by to 2/6 is to 24/72 ?

Acivilization exists for several hundred yeaars, developing its own language. such a civilization probably has been: a. farming corn b. suffering from a lack of contact with the outside world. c. isolated by mountains or some other physical barriers. d. starving from lack of trade.

Which event had the greatest impact on culture of south america