Transitional Fossils

What we can learn from "Your Inner Fish"

Did legs evolve in the water or on the land?

Vertebrate appendages

  1. Study the graphic showing examples of 4 types of appendages in vertebrates.
  2. What similarities and differences do you see in these bone structures?
  3. What might this say about the common ancestors of four-limbed vertebrates?
  4. What do you notice about the placement and structure of the humerus, radius, and ulna in each of the arm skeletons?
  5. Why might these three animals show similarities and differences in the structure of their forelimbs?

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