They hypothesized that the transitional fossils were in sedimentary rocks older than 365 million years ago, when the first tetrapods appear in the fossil record.
  • Why have we NOT found examples in the fossil record of every animal that ever lived on Earth?
  • How did the great transition from fish to tetrapod occur?
  • Why did Shubin and Daeschler search in the Canadian arctic for fossil evidence of the transition from fish to tetrapods?
  • Tiktaalik had a combination of fishlike and tetrapod-like characteristics. Which were the tetrapod-like characteristics?
-a neck-interlocking ribs-flat head with eyes on top
  • How did the great transition from fish to tetrapod occur?
  • Why have we NOT found examples in the fossil record of every animal that ever lived on Earth?
  • Tiktaalik had a combination of fishlike and tetrapod-like characteristics. Which were the tetrapod-like characteristics?
  • Why did Shubin and Daeschler search in the Canadian arctic for fossil evidence of the transition from fish to tetrapods?
Transitional fossils have features that are intermediate between ancestors and descendants.
  • What is a transitional fossil?
  • Why did Shubin and Daeschler search in the Canadian arctic for fossil evidence of the transition from fish to tetrapods?
  • How did the great transition from fish to tetrapod occur?
  • Which of the following is a tetrapod?
-DNA analysis shows that fish are tetrapods' closest relatives.-The fossil record shows more and more tetrapod-like fish before the appearance of tetrapods about 365 million years ago.-Both fish and four-limbed animals are vertebrates.-Fish and four-limbed animals have very similar embryos.
  • Which evidence supports the hypothesis that four-limbed animals came from fish?
  • How did the great transition from fish to tetrapod occur?
  • Why have we NOT found examples in the fossil record of every animal that ever lived on Earth?
  • Why did Shubin and Daeschler search in the Canadian arctic for fossil evidence of the transition from fish to tetrapods?
Tiktaalik lived in a warm, freshwater swamp.
  • What is a transitional fossil?
  • How did the great transition from fish to tetrapod occur?
  • What kind of habitat did tiktaalik live in?
  • Which of the following is a tetrapod?
-To become a fossil, an animal must remain buried for thousands or millions of years until it (and the layer around it) turns to rock.-Many fossils remain buried. We can only find them when they are exposed by erosion or excavation.-To become a fossil, an animal must be quickly and completely buried in ash or sediment before it has a chance to decompose.
  • Tiktaalik had a combination of fishlike and tetrapod-like characteristics. Which were the tetrapod-like characteristics?
  • Why have we NOT found examples in the fossil record of every animal that ever lived on Earth?
  • Which of the following is a tetrapod?
  • Why did Shubin and Daeschler search in the Canadian arctic for fossil evidence of the transition from fish to tetrapods?
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