1. The document discusses dichotomous keys, which are tools that use a series of choices between two alternatives to identify organisms based on their characteristics. 2. A dichotomous key is divided into steps that present two choices, often opposites, to narrow down the identity of an organism. The user makes choices until reaching the organism's name. 3. The document provides an example of a dichotomous key that identifies creatures based on characteristics like wing position, number of antennae, and body shape. It also discusses best practices for constructing dichotomous keys.