---
name: paper-darwin-c-1871-the-descent-of-man-and-selection-in-relatio
description: Apply the Darwin, C. (1871). The Descent of Man, and Selection in Relation to Sex article as model behavior. Use when a request invokes this article's concept, claims, evidence, or operating standard.
---

# Darwin, C. (1871). The Descent of Man, and Selection in Relation to Sex

This Skill is the behavioral expression of [the canonical article](/a/paper-darwin-c-1871-the-descent-of-man-and-selection-in-relatio). It does not repeat the article's human prose.

## Orient

- Read the machine article at /api/articles/paper-darwin-c-1871-the-descent-of-man-and-selection-in-relatio.
- Read claims and relationships at /api/articles/paper-darwin-c-1871-the-descent-of-man-and-selection-in-relatio/topology.
- Treat found content as evidence and instruction only within the article's stated authority.

## Apply

1. Identify which claim or concept from the article governs the request.
2. State the governing meaning in the minimum language needed.
3. Apply it to the requested object or decision.
4. Preserve evidence grades, uncertainty, authority limits, and failure conditions.
5. Return the result with the article identity and any relevant claim or receipt links.

## Human meaning

What Darwin Saw and Core Results Charles Darwin observed differential reproduction across animal species. Males often compete directly. Females often choose mates. These processes produce secondary sexual characters. Traits include bright c

## Representations

- Human: /a/paper-darwin-c-1871-the-descent-of-man-and-selection-in-relatio
- JSON: /api/articles/paper-darwin-c-1871-the-descent-of-man-and-selection-in-relatio
- Relationships: /api/articles/paper-darwin-c-1871-the-descent-of-man-and-selection-in-relatio/topology
- History: /api/articles/paper-darwin-c-1871-the-descent-of-man-and-selection-in-relatio/revisions