Final answer:
Primary activity involves the collection of raw materials in economic sectors and has evolved with technological advancements.
Explanation:
Primary activity refers to economic sector activities that involve the collection of raw materials like agriculture, forestry, fishing, and mining.
This sector played a crucial role in the US economy during colonial times and into the nineteenth century, where the majority of economic activities happened within the primary sector.
Advancements in technology have allowed the primary sector to continue growing, with fewer people employed in sectors like farming but with increased agricultural output due to mechanization and technological developments.
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