Advertising is a activity. supply of replacement parts is a activity. support; primary primary; primary support; secondary primary; support

Michael Porter  defined the primaty activities in his value chain.
Advertising is a primary activity. Supply of replacement parts is a primary activity. support; primary primary; primary support; secondary primary; support. These activities are used to provide a company with a competitive advantage in any one of the five activities so it has an advantage in the industry in which it operates and include logistics, operations, outbound logistics, marketing and sales, and service.

We can plant more trees and plants.