Answer:
The correct answer would be a) circulatory system.
A stroke is primarily caused due to reduced or interrupted supply of blood to the brain.
The blood supply is usually reduced as a result of blockage or bursting of an artery carrying blood to the brain.
Consequently, the brain cells experience a lack of oxygen and nutrients due to which they begin to die.
Thus, stroke is initially caused by damage to the circulatory system.
7 valence electrons
Explanation:
Cells / Cells Unit
The reason why cells is the basic unit of structure and function in all living things is because the cells form parts for the organism and it carries out all of the organism's processes or it's functions.
