What is the firsthand historical evidence used to support a claim in an argumentative essay called?
an expert source
a primary slunce
an academic source
a secondary source

primary source

Explanation:

a primary source

Explanation:

A primary source refers to first hand record such as artifact, autobiography, recording etc. This is the contemporary information generated at the time under study. Primary source provides most direct evidence to support a claim as the sources are created by people or things that were at that particular time but not based on the secondary interpretation from third parties.

The format of primary source can be transform from one format to another format. For example, the hard copy of primary source can be digitized to a e-copy but the original contents remain unchanged.

the correct answer is b, "fertility rates are increasing, so populations will grow more quickly in the future."