Conjugation is when genetic material is transferred from one bacteria to another via direct contact. Neither of these options are completely correct, but the more correct one would be the first.
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.
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Light is to find the distance between planets called light years.
