In the Evolution of the Vertebrate Circulatory System, a Transitional

question 93

Multiple Choice

In the evolution of the vertebrate circulatory system, a transitional step led to separate pulmonary and systemic circuits. This step can be observed in

• A) lungfish.
• B) the ancient ostracoderm.
• C) birds.
• D) amphibians.
• E) reptiles.

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