Final answer:
The primary industry includes a firm's key business units, whereas the secondary industry includes the firm's less significant business units is false.
Step-by-step explanation:
The statement that the primary industry includes a firm's key business units, whereas the secondary industry includes the firm's less significant business units is False. The primary industry refers to economic activities that involve the collection of raw materials, such as agriculture, forestry, fishing, and mining.
On the other hand, the secondary industry encompasses the processing and transformation of those raw materials into finished goods through manufacturing. Therefore, it is the secondary industry that involves a firm's key business units, while the primary industry focuses on the extraction of raw materials.