Answer:
When the insulation around a wire is worn or frayed.
Explanation:
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Cell-mediated immunity <span>provides defense against viruses, abnormal cells, and other intercellular pathogens.</span>
Answer:
Cells are the basic units of life. Cells can exist by themselves, like bacteria, or as part of a larger organism, like our cells. Viruses are non-living infectious particles, much smaller than a cell, and need a living host to reproduce. The genetic material of the cell is DNA, a double stranded helix.
Explanation: