Which animals would be the best for illustrating the evolutionary transition of the vertebrate circulatory system from a single loop system to one with separate pulmonary and systemic circuits?
A) Lungfishes
B) Mammals
C) Birds
D) Amphibians
E) Reptiles

Question

Quizplus · Accepted Answer

Lungfishes are considered a transitional species because they have a partially divided heart, which represents an evolutionary step between the single-loop system of fish and the double-loop system of amphibians, reptiles, birds, and mammals.

Which Animals Would Be the Best for Illustrating the Evolutionary