Evidence of Evolution- fossils & Biogeography 7A



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Evidence of Evolution- Fossils & Biogeography
7A. Analyze and evaluate how evidence of common ancestry among groups is provided by the fossil record, biogeography, and homologies, including anatomical, molecular, and developmental.

7B. Analyze and evaluate scientific explanations concerning any data of sudden appearance, stasis, and sequential nature of groups in the fossil record.
Directions: Answer the following questions in complete sentences. You may use your notes from lecture, your knowledge from the video we watched, or the text book (p289, 298-299).


  1. What is a fossil?


  1. What kind of information can you learn from a fossil?


  1. What does the fossil record allow us to infer?


  1. What is gradualism? What evidence is there for gradualism?


  1. What is stasis? What evidence is there for stasis?


  1. What is punctuated equilibrium?


  1. Compare gradualism and punctuated equilibrium. Draw a picture to show these two ideas.


  1. How do most scientists explain the gaps in the fossil record? What do YOU think?


Use the picture to the right to answer questions 9 & 10


  1. Which rock layer is the oldest? How do you know?



  1. Which rock layer is the youngest? How do you know?


  1. Explain what scientists can learn about evolution when comparing different fossils in different rock layers. You can use the picture to the right to explain your ideas. (Use terms like relatedness, extinction, transition etc.) Write at least two complete sentences.

This is a series of skulls and front leg fossils of organisms believed to be ancestors of the modern day horse.

  1. Describe how both the skull anatomy and leg anatomy have changed from Eohippus to Equus.



  1. What is the biggest change in the skull anatomy from the Dawn horse to the modern horse?



  1. What is the biggest change in the leg anatomy from the Dawn horse to the modern horse?



  1. Give at least two similarities between the skulls that might lead to the conclusion that these bones are from related species.



  1. What is biogeography?



  1. How does geography (and biogeography) support the theory of evolution? (this explanation should be at least 2 sentences)


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