I am a type of leukocyte that sounds an alarm when infectious microbes invade your blood. I also help to break down bacteria. I help with reactions that cause allergic symptoms. I can also help repair wounds and destroy early cancer cells. What am I?

Basophils

Explanation:

These small cells seem to sound an alarm when infectious agents invade your blood. They secrete chemicals such as histamine, a marker of allergic disease, that help control the body's immune response.

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meiosis is the first to occur after the nuclei of opposite of opposite mating types fuse