Question

a paragraph in a biography explains how abraham lincoln worked tirelessly to keep the united states together during the civil war. this is an example of: topic sentence central idea moral theme

Explanation:

The central idea of a text (or a paragraph, in this case) is the main point or the key message that the author is trying to convey. Here, the paragraph is about how Abraham Lincoln worked to keep the US together during the Civil War, which is the main point (central idea) of that paragraph. A topic sentence is usually the first sentence introducing the topic, a moral is a lesson, and a theme is a broader, recurring idea (not specific to a single paragraph's content like this).

Answer:

central idea