Answer:
I'm sure but send thru this picture for the question so I can help.
The upper chambers are called the left and right atria, and the lower chambers are called the left and right ventricles. A wall of muscle called the septum separates the left and right atria and the left and right ventricles
The answer is A. The element is sodium (Na) and is highly reactive
The increase of angles between two bones is and ankle
