音频游览 Life on earth

游览停留

• The origin of life on earth: meteorites
• The creation of earth and the beginning of life
• Nearly 1 billion years later
• 2.5 billion years ago
• 400 million years ago
• 600 to 500 million years ago
• 255 million to 300000 years ago
• Dinosaurs
• Stegosaurus
• Fossil wood