"№3. True or false. If you chose \"false\", correct the statement\n\n1) The immune system plays an important role because it protects the body from harmful substances and microbes that can lead to various diseases.\n\n2) Microbes that the body has never encountered before cannot cause disease.\n\n3) The immune system is not necessary to fight harmful substances entering our body from the outside.\n\n4) The innate immune system mostly fights using immune cells such as natural killer cells and phagocytes (\"eating cells\").\n\n5) The innate immune system provides a general defense against harmful germs and substances, so it's also called the specific immune system.\n\n6) Because the adaptive immune system is constantly learning and adapting, the body can also fight bacteria or viruses that change over time.\n\n7) A night's sleep and stress do not affect the immune system in any way.\n\n8) Our immune, nervous and hormonal systems work in constant interaction."