Snakes are limbless reptiles, and it has long been debated how they evolved to lose their legs. Some theories suggested that snakes evolved from burrowing lizards, while others proposed that they evolved from aquatic reptiles.

However, the discovery of the 99-million-year-old reptile fossil, known as Xiaophenglong, provides strong evidence that snakes evolved from lizards that lived on land. The Xiaophenglong fossil shows that snakes evolved their long, limbless bodies as a way to burrow underground.

Xiaophenglong had a long, slender body and small, vestigial legs. This suggests that it was a transitional species between lizards and snakes, and that snakes evolved from lizards that were beginning to adapt to a burrowing lifestyle.

The fossil of Xiaophenglong was discovered in the amber mines of Hukawng Valley, Myanmar. This area is known for its rich fossil deposits, and it has yielded many important fossils in the past, including the skulls of early primates and the feathers of dinosaurs.

The discovery of the Xiaophenglong fossil is a major breakthrough in the study of snake evolution. It provides strong evidence that snakes evolved from lizards that lived on land, and it helps to explain how snakes evolved to lose their legs.

Here is a summary of the key points from the article:

- A 99-million-year-old reptile fossil has been discovered in Myanmar.

- The fossil shows that snakes evolved from lizards that lived on land.

- Snakes evolved their long, limbless bodies to adapt to a burrowing lifestyle.

- The fossil provides strong evidence for the theory of snake evolution.