The Forelimbs of Tiktaalik Have Bones,but Are Fringed with Fins

question 2

Multiple Choice

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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