Answer: A host is an organism that harbors another organism (parasite) inside or near its own body, typically providing nourishment and shelter for the parasite. Take one of nature's most annoying insects: the mosquito! Mosquitoes are predators that feed on the blood of animals, including humans. With each bite, mosquitoes extract needed nourishment and leave behind itchy, irritating bumps on the host's skin. But watch out… mosquitoes can also leave behind potentially dangerous diseases such as West Nile virus, Zika virus, and malaria. Once infected, hosts may become extremely ill or die.
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