Video - Primeiros Seres: A história dos primeiros tubarões e árvores.

First Sharks: The first sharks appeared on Earth about 400 million years ago, during the Devonian period. They are one of the oldest life forms still existing today. Ancient Fossils: Ancient shark fossils show that these early sharks had some very different characteristics from modern species, but also many similarities, such as sharp teeth and body structures adapted for hunting. 2. Evolution of Trees: First Trees: The first trees appeared about 350 million years ago, during the Carboniferous period. These early plants were quite different from modern trees, with simpler structures. Land Plants: Before trees, land plants existed, but they were mainly small herbaceous plants and mosses.