Tiktaalik roseae (fishapod) is a transitional fossil showing the evolutionary progression of fish to
amphibians. Which of the following must be true? A. It must retain some traits found in its fish
ancestors B. It must have new traits found in amphibians, but not found in its fish ancestors C. It
must appear younger in the fossil record than its fish ancestors D. Only A and B E. A, B, and C
Solution
The answer should be D (which includes A & B )
because Tiktaalik shares anatomical features with both primitive fish and the first tetrapods. At
first glance, it has features we readily associate with fish: fins, scales, and gillsTiktaalik\'s head
and body are flat with eyes on the top of its skull, more like a crocodile than most fish. Its
shoulders are not connected to its skull, giving it a functional neck, a feature which fish lack.
And it has ribs like some of the earliest tetrapods which were used to support the body and aid in
living and breathing on land. These features in Tiktaalik show that many of the body features we
associate with the earliest tetrapods actually evolved in fish first..
Tiktaalik roseae (fishapod) is a transitional fossil showing the evo.pdf
1. Tiktaalik roseae (fishapod) is a transitional fossil showing the evolutionary progression of fish to
amphibians. Which of the following must be true? A. It must retain some traits found in its fish
ancestors B. It must have new traits found in amphibians, but not found in its fish ancestors C. It
must appear younger in the fossil record than its fish ancestors D. Only A and B E. A, B, and C
Solution
The answer should be D (which includes A & B )
because Tiktaalik shares anatomical features with both primitive fish and the first tetrapods. At
first glance, it has features we readily associate with fish: fins, scales, and gillsTiktaalik's head
and body are flat with eyes on the top of its skull, more like a crocodile than most fish. Its
shoulders are not connected to its skull, giving it a functional neck, a feature which fish lack.
And it has ribs like some of the earliest tetrapods which were used to support the body and aid in
living and breathing on land. These features in Tiktaalik show that many of the body features we
associate with the earliest tetrapods actually evolved in fish first.
