Transitional species are species important in helping scientists determine the evolutionary path that species have taken over long periods of time.
Lobe-finned fishes are the ancestors of amphibians and have fossils that are found in rocks that are at least 380 million years old. Fossils of the oldest amphibian-like vertebrate animals with true legs and lungs are found in rocks that are approximately 363 million years old.
Paleontologists have found a sample of rock that is approximately 370 million years old which contains what seems to be a link between lobe-finned fishes and amphibians.
Which of the following is a characteristic that you would not expect to see in this transitional fossil?
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Skeletal structures that indicate the development of legs. |
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An intermediate structure between lungs and gills. |
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Teeth that are intermediate to the lobe-finned fishes and amphibians. |
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A neck that is more flexible than lobe-finned fishes. |
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