When lungs evolved in vertebrates,an event also occurred in the circulation of blood within those vertebrates.The event was
A)the evolution of double circulation.
B)the evolution of red blood cells which could carry more oxygen.
C)the evolution of a lymphatic system to work in coordination with the circulation system.
D)the evolution of muscles that could coordinate a pumping action.
E)the evolution of a more fluid blood,that is a blood with more plasma.

Question

Quizplus · Accepted Answer

The evolution of lungs allowed for more efficient oxygen uptake, which then led to the evolution of double circulation. This means that blood is pumped to the lungs to pick up oxygen and then goes back to the heart before being pumped out to the rest of the body. Double circulation is important because it allows for a higher oxygen delivery to the tissues.

When Lungs Evolved in Vertebrates,an Event Also Occurred in the Circulation