Question

fill in the blank question
t cells that attack foreign cells are
t cells.
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Explanation:

In immunology (a subfield of Biology, which is a Natural Science), T cells have different types. Cytotoxic T cells (also called killer T cells) are responsible for attacking foreign cells, such as infected cells or cancerous cells, by recognizing the antigens presented on their surface and then eliminating them.

Answer:

cytotoxic (or killer)