Answer:
Blood vessels are the channels or conduits through which blood is distributed to body tissues. The vessels make up two closed systems of tubes that begin and end at the heart. One system, the pulmonary vessels, transports blood from the right ventricle to the lungs and back to the left atrium.
Explanation:
Age causes the tree bark to darken
What? Wym??? Where’s the picture
Answer:
respiratory system
Explanation:
we just finished body system