Fossils of Thrinaxodon, a Species That Lived During the Triassic

question 30

Multiple Choice

Fossils of Thrinaxodon, a species that lived during the Triassic period, have been found in both South Africa and Antarctica. Thrinaxodon had a reptile-like skeleton and laid eggs, but small depressions on the front of its skull suggest it had whiskers and, therefore, fur. Thrinaxodon may have been warm-blooded. The fossils of Thrinaxodon are consistent with the hypothesis that ________.

• A) fossils found in a given area look like the modern species in that same area
• B) the environment where it lived was very warm
• C) mammals evolved from a reptilian ancestor
• D) Antarctica and South Africa separated after Thrinaxodon went extinct

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