As the de-saturated blood leaves the right ventricle, it passes through the pulmonary valve, which has been closed as the right ventricle was filling. The pulmonary valve opens, allowing the blood to leave the right ventricle and flow to the lungs via the pulmonary artery. Once the right ventricle has emptied, the pulmonary valve closes, thereby keeping the blood from re-entering the right ventricle.
Answer:
A = T and G = C.
A = 31.5% and so T =31.5%. this adds up to 63%.leaving 37%.
G = C = 18.5%.
Explanation:
This is really basic, containing much on the history of cell biology. The cell theory, or cell doctrine, states that all organisms are composed of similar units of organization, called cells. The concept was formally articulated in 1839 by Schleiden & Schwann and has remained as the foundation of modern biology.
Biosphere life-forms<span> are only found in the hydrosphere and atmosphere. </span>Biospherelife-forms<span> are only found in the hydrosphere and atmosphere.
hope this helps :P </span>