According to the article, WHY did the wedge originally get invented?
It was produced to stop friction from separating things.
It was made to replace the inclined plane in axes and knives.
It was not invented because it exists naturally in the environment.
It was created to be used in stone tools by our ancient ancestors.

Is there you can attach the article?

Explanation:

Tenements were first built to house the waves of immigrants that arrived in the United States during the 1840s and 1850s, and they represented the primary form of urban working-class housing until the New Deal. A typical tenement building was from five to six stories high, with four apartments on each floor.