The cells that perform immunological surveillance are the cells.

The correct answer is "Natural killer".

Explanation:

Natural killer cells, also known as NK cells or large granular lymphocytes, are cells that have an essential role in the innate immune system. Nk cells perform immunological surveillance, and are important for prevent the growth of tumors and develop chancer. Nk cells are able to recognize targets that are only present in cancerous cells, killing them before they start to proliferate.

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.

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