In the Section "Investigating Life: Discovering the 'Fishapod'",the Forelimbs of Tiktaalik

question 96

Multiple Choice

In the section "Investigating Life: Discovering the 'Fishapod'",the forelimbs of Tiktaalik have bones,but are fringed with fins instead of toes (Fig.20.57) .Which of the following is the best explanation for this observation?

• A)This is a transitional fossil,and the species has not yet lost its arm bones.
• B)This is a common ancestor to all of the modern fish species that have bones in their forelimbs.
• C)This is a common ancestor to all of the modern amphibian species that have fins on their forelimb.
• D)This is a transitional fossil,and the species has not yet lost its fins.
• E)This species was an evolutionary dead end,which is why no modern species have both bones and fins on their forelimbs.

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