C105 The Opportunity of the Unknown Island

While his heart was beating faster and faster, Ye Lee started to think about why the plants and animals on this island were so big. Was it because of the high oxygen concentration on this island?

Biologists have discovered the fossils of many large organisms, which they discovered existed between 286 and 320 million years ago in the Carboniferous period.

It was warm, humid, and swampy