What are snakes? Evolution and biology
Two pythons: evolution of snakes When did snakes evolve? Snakes evolved from lizards only about 150 million years ago, during the Jurassic Period. This is during the time of the dinosaurs, about the [...]
Two pythons: evolution of snakes When did snakes evolve? Snakes evolved from lizards only about 150 million years ago, during the Jurassic Period. This is during the time of the dinosaurs, about the [...]
A turtle in the desert During the Triassic period (about 248 to 199 million years ago), most of Earth's land continued to stick together in one big supercontinent, Pangaea. Because [...]
Crocodiles About 290 million years ago, the Carboniferous period ended and the Permian period began. Almost all of the land on Earth grouped together in one big supercontinent we call [...]
Dragonfly When was the Carboniferous period? With the end of the Devonian period about 359 million years ago, the Carboniferous period got started. More about the Devonian Quick summary of [...]
Fish eggs: Egg evolution starts with soft eggs like these When did the first eggs evolve? The earliest living creatures made babies by dividing themselves in half, so that one [...]
Evolution of skeletons: Skeleton of a dinosaur Evolution of skeletons From frogs, there evolved reptiles like crocodiles and dinosaurs. Some of these reptiles lived mostly or entirely on land, so [...]
Fish gills The first cells, which evolved about 3.8 billion years ago, needed carbon dioxide to live and not oxygen. They needed the carbon dioxide to help them break down [...]
Reproduction: Hydra budding new hydras RNA and DNA molecules The first form of reproduction began about four billion years ago, when first RNA molecules and then DNA molecules began to make [...]
Evolution of turtles: Seychelles tortoise (Jardin des Plantes, Paris) Evolution of turtles The first turtles began to evolve from earlier reptiles about 225 million years ago, during the Triassic period. [...]
Boa Constrictor snake Some kinds of amphibians evolved into reptiles about 300 million years ago. At this time, plate tectonics had moved more and more of the land on Earth into [...]