Evolution shows that all life on earth is

a)old
b)brand new
c)the same as it was millions of years ago
d)related

Killer T-cells find and destroy infected cells that have been turned into virus-making factories. To do this they need to tell the difference between the infected cells and healthy cells with the help of special molecules called antigens. Killer T-cells are able to find the cells with viruses and destroy them.

Explanation:

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