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Sagot :
Option b is correct i.e. Cytotoxic T cells of immune system kills some body cells infected with an influenza (flu) virus.
Your child's immune system defends their body from external threats. These include pathogens, bacteria in various forms, viruses, fungus, and toxins (chemicals made by microbes). A collection of organs, cells, and proteins that cooperate to form the immune system. This is how your youngster responds quickly. If an intruder is discovered, it is the first to react. This structure is made up of the mucous membrane that covers the respiratory, genitourinary, and digestive systems, the cornea of the eye, and the skin. All of them build physical barriers to shield your child's body from harm. They defend themselves against dangerous cells, parasites (such as worms), and microorganisms. One inherits the innate immune system. It begins to function the moment your child is born. When an incursion is found, this system reacts quickly. The immune system's cells encircle and cover the invader. Within immune system cells, the invader is destroyed (called phagocytes).
To know more about immune system please refer: https://brainly.com/question/18733724
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