It should be A because this system relies on antigens which are specific substance found in foreign microbes.
<span>The mitral valve does this between the left atrium and ventricle. The "lub" is the sound of the tricuspid and mitral valves closing. Each of your heart's ventricles has an outlet valve. The right ventricle uses the pulmonary valve to help move blood into the pulmonary arteries.</span>
It is a mixture from both Hereditary traits and traits gained from the environment where you were born or in general.
Texting and driving because the motorists takes their eyes off the road and realizes that they have to stop at the last minute.
Bronze is a homogeneous mixture
