What are missing links?

Explanation

**Step-by-Step Text Solution:**

1. **Definition of Missing Links**: Missing links are organisms that exhibit characteristics of two distinct taxonomic groups, thereby providing evidence of evolutionary transitions between those groups.

2. **Characteristics of Missing Links**: These organisms can be either extinct or extant (still living) and possess traits that are representative of both groups they connect. This duality in characteristics helps scientists understand evolutionary relationships.

3. **Example of Archaeopteryx**: One of the most well-known examples of a missing link is Archaeopteryx. This organism displays features of both reptiles and birds. It had the ability to fly, indicated by its wing structure, but its skeletal features were more similar to those of reptiles.

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