I thinking A. or B. but im sure it one of them. that's a 50% chance.
The essential components of the human cardiovascular system are the heart, blood and blood vessels. It includes the pulmonary circulation, a "loop" through the lungs where blood is oxygenated; and the systemic circulation, a "loop" through the rest of the body to provide oxygenated blood.
Hope this helps!
Shield volcanoes<span>, </span>stratovolcanoes<span> or composite</span>volcanoes<span>, lava domes and </span><span>flood basalts</span>
Global warming
The increase of greenhouse gases result into global warming :)
