Answer:
Ventricles
Explanation:
The left ventricle recieves the blood from left atria which in turn recieves blood from the pulmonary vein that brings oxygenated blood from heart.
Next, the right ventricle receives blood from right atria which gets it's blood from vena cava, which brings deoxygenated blood from lower and upper half of body.
A - a lower disease rate in babies and children
D - regular medical checkups for adults
Hydrological cycle. is the answer
You could allow him to go around obstacles too difficult.
