Interpreting the Tracks

• Life forms of the past were in some ways very different from living forms of today, but in other ways very similar.
• Most species that once lived on Earth have gone extinct.
• Fossils provide evidence of past life.
• Scientists pose, test, and revise hypotheses based on research outcomes.
• Science explains the natural world using evidence from the natural world.
• We can learn about the natural world using our senses and extensions of our senses.
• Scientific ideas are developed through reasoning.
• Science does not prove or conclude; science is always a work in progress.
• Scientists use multiple lines of evidence to study life over time.
• Scientists use fossils to learn about past life.
• Scientists use geological evidence to establish the age of fossils.

• Evidence for Evolution
• Nature of Science