What is the body's first line of defense against bacteria and viruses

Mucus, saliva but also there is something called the lymphatic system which is part of the circulatory system and consists of lymphatic vessels and lymphnods, lymphnods are all over you body

Afew buddies come over to your house to hang out. they notice you're struggling in school, perhaps you have to rely on to pass your class, but you can't absorb the knowledge. they could positively reinforce getting a tutor and working with you, dedicating more time to the areas of struggle and less on hanging out to better yourself.secondly, say you're the victim of bullying. you're afraid to tell an adult because of possible repercussions from the bully himself. your friends encouraging you and pushing you towards telling an adult for your safety is another example.