Duolingo Is a Free App That Includes In-App Advertising

question 42

Multiple Choice

Duolingo is a free app that includes in-app advertising.There is also an upgraded version that consumers can purchase.What type of business model does Duolingo use?

• A) Both franchise and advertising
• B) Both freemium and differentiation
• C) Both freemium and advertising
• D) Peer-to-peer

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Definitions:

Chemical Weathering

Chemical reactions that affect a rock or other material by breaking down minerals and removing soluble material from the rock.

Physical Weathering

The physical breaking or disintegration of rocks when exposed to the environment.

Sedimentary Environments

Areas where sediment is deposited on the Earth's surface, including lakes, rivers, deserts, and marine settings, each of which leaves distinct geological records.

Topography

The arrangement of the natural and artificial physical features of an area, including its relief, and any landforms and bodies of water.