Definitely the answer is B
Answer:
B.
Explanation:
Macrophages are specialized cells involved in the detection, phagocytosis and destruction of bacteria and other harmful organisms. In addition, they can also present antigens to T cells and initiate inflammation by releasing molecules (known as cytokines) that activate other cells.
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Answer: The wireless signals can carry large amounts of data at high radio frequencies.
Explanation: the others don’t specify the kind of signal
Answer:
Food is exposed to a carefully measured amount of intense ionizing radiation. ... With food irradiation, radiant energy (electrons, gamma rays, or x-rays) breaks chemical bonds, leaving the food still like-fresh, but with specific benefits, depending on treatment level.