Fish with muscular fins attached to the body by a fleshy shaft and a series of articulating bones are ____.
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Which of the following does not produce amniote eggs?
Which of the following does not produce amniote eggs?
What feature in the Gulf of Mexico led to the formation of p…
What feature in the Gulf of Mexico led to the formation of petroleum?
Birds evolved from theropods during the ____________ period.
Birds evolved from theropods during the ____________ period.
What was the first major transgression during the Mesozoic?
What was the first major transgression during the Mesozoic?
The two major groups of dinosaurs were the:
The two major groups of dinosaurs were the:
The Sundance Sea transgression took place before the Cretace…
The Sundance Sea transgression took place before the Cretaceous Interior Seaway formed.
Most of Earth’s coal deposits formed due to widespread _____…
Most of Earth’s coal deposits formed due to widespread ___________ conditions.
What adaptation allowed reptiles to thrive in terrestrial en…
What adaptation allowed reptiles to thrive in terrestrial environments over their amphibian counterparts?
During the early Paleozoic, two cratonic sequences were depo…
During the early Paleozoic, two cratonic sequences were deposited in North America, the _______ and the ________ sequences.