History of Life on Earth Video Lessons

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Problem: Which of these would a paleontologist be most likely to do in order to determine whether a fossil represents a reptile or a mammal? A) Look for the presence of milk-producing glands. B) Look for the mammalian characteristics of a four-chambered heart and a diaphragm. C) Because mammals are eutherians, look for evidence of a placenta. D) Use molecular analysis to look for the protein keratin. E) Examine the teeth

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Mammalian vs. Reptilian Fossils:

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Problem Details

Which of these would a paleontologist be most likely to do in order to determine whether a fossil represents a reptile or a mammal? 

A) Look for the presence of milk-producing glands. 

B) Look for the mammalian characteristics of a four-chambered heart and a diaphragm. 

C) Because mammals are eutherians, look for evidence of a placenta. 

D) Use molecular analysis to look for the protein keratin. 

E) Examine the teeth

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