The correct answer is B. Brown eyes are dominant. Each parent has a brown gene and a blue gene. Their child got the blue gene from each parent and has two blue genes which is the only way recessive genes are phenotypically expressed.
The body circulatory system is made of two paths namely pulmonary circulation which is the circuit or path that goes through the lungs where blood is oxygenated, and systemic circulation which is the circuit or path that goes to all the rest of the body to provide it with oxygenated blood.
Pulmonary circulation is the movement of blood from the heart to the lungs then back to heart again. Systemic circulation is the movement of blood from the heart to and through the rest of the body to provide oxygen and nutrients, bringing the deoxygenated blood back to the heart again.
