Biology r13

• A group of organisms that are closely related because they have evolved from a common ancestor
• Most animals produce a lot of offspring.
• These offspring are all different, they show variation.
• Some offspring will be better at surviving than their siblings.
• Those that survive are able to reproduce and pass on their genes to the next generation.
• Under what conditions do these changes happen?

  No/low - Oxygen

  High - Pressure

  Hard - Water
• From a fossil we learn that

  The Depth - How old it is

  The Bones - How tall it is

  The Teeth - What it ate
• The longest aeon is Protozoic, which lasted 2.5 billion years.
• The shortest period is silurian it lasted 25 million years ago.
• In what era did the first animals appear.

  Palaeozoic (Cambrian Period)
• The Cambrian was named after wales
• What does "Carboniferous" mean?

  It means Carbon-Bearing
• The term Niche refers to the specific job/role in the ecosystem
• Dinosaurs were land dwelling reptiles, which could grow up to enormous sizes.
• Examples of dinosaurs are Allosaurus and Stegosaurus
• Plesiosaurs were the marine reptiles that had long necks.
• Pterosaurs were flying reptiles. Their wingspan was up to 25cm to 10m.
• Archeopteryx is often described as the first bird.
• What is extinction?

  Extinction is nomore of that species left.
• the most famous creature of the cretaceous period is the Tyrannosaurus rex.
• What is this creature's name?

  Tyrannosaurus Rex

  
• No longer in existence leaving no living representatives.