<span>Desalination is a process where salts and or minerals are removed from a saline water. Desalination is expensive. It is expensive because it needs a lot of energy source---electricity. Therefore, the answer to this question is letter B., Desalination uses large amounts of energy.</span>
The answer is natural killer cells.
Natural killer cells are a type of lymphocytes and they are important for the innate immune system. They recognise stressed cells much faster than other immune cells. Their response is rapid and usually only a few days after a viral infection. They also respond to <span>cancer cell </span>formation. While other immune cells can detect only those harmful cells that have specific markers on the surface of the cell membrane, natural killer cells can even detect those cells that miss markers for apoptosis.
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that salad was really hot don´t judge me