Question
Question: Mammals are said to have a "double circulatory system''. This means...
Mammals are said to have a "double circulatory system''. This means
A
That the blood vessels are paired
B
That there are two types of blood vessels attached to every organ; an artery and a vein
C
That there are two system; one from the heart to the lungs and back to the heart and other to and from rest of the body
D
That the blood circulates twice as quickly
Answer
That there are two system; one from the heart to the lungs and back to the heart and other to and from rest of the body