Evolution: fossils

• What should you be able to do by the end of the video on fossils?

  Discover fossils, provide evidence for evolution, and explain how species can become extinct.
• Why are fossils considered good evidence for evolution?

  Fossils are the remains of organisms from millions of years ago, showing changes over time.
• What is the definition of fossils?

  Fossils are the remains of organisms from millions of years ago found in rocks.
• How can fossils form according to the video?

  Fossils can form when parts of organisms do not decay, are replaced by minerals, or leave preserved traces.
• What conditions can prevent the decay of an organism, leading to fossil formation?

  Conditions such as cold temperatures, lack of oxygen, or insufficient water can prevent decay.
• How can fossils form even if an organism decays?

  Parts of the organism can be slowly replaced by minerals during the decay process.
• What are some examples of preserved traces of organisms?

  Footprints of animals and preserved spaces where roots were can be examples.
• Why are there very few fossils of early life-forms?

  Many early life-forms were soft-bodied and rarely formed fossils, and existing fossils may have been destroyed.
• What does the lack of early life-form fossils imply for scientists?

  Scientists cannot be certain how life on Earth began due to the scarcity of early fossils.
• What does it mean for a species to be extinct?

  A species is extinct when there are no remaining individuals of that species still alive.
• What are some reasons species can become extinct?

  Species can become extinct due to catastrophic events, environmental changes, or competition from more successful species.
• What catastrophic event led to the extinction of the dinosaurs?

  An asteroid colliding with the Earth led to the extinction of the dinosaurs.
• How can environmental changes lead to species extinction?

  Changing weather patterns, new diseases, or new predators can lead to extinction.
• How can competition from more successful species lead to extinction?

  New, more successful species can compete for scarce resources like food or water, leading to extinction.
• Where can you find questions on fossils and extinction related to this video?

  You can find questions in the vision workbook linked in the video.