I finally know the second part of my main question! Pathogen!! Types of pathogen include bacteria, viruses, parasites, and fungi. These things can trigger your immune system immediately. Here is an explanation of all the pathogens:

Bacteria attack and digest tissue for themselves so they can have something to eat. Bacteria are scavengers, so they want to take as much as they can before the immune response destroys them. Bacterial diseases include strep throat, tetanus, Lyme disease and meningitis. Cavities are also just sugar-loving bacteria that eat away at your teeth. Viruses are a bit different. They invade cells and occupy them, so the virus gets all the nutrients they need to survive. They use the cell to multiply so when the cell dies each virus goes for another cell, multiplying even more. If a virus finds itself outside a warm cushy body, like on a door handle, it dies almost instantly because it doesn’t have any organisms to invade. Viral diseases include the chicken pox, Ebola, and HIV. Over 200 viruses are responsible for what we call the “common cold”. Parasites are also scavengers but are usually a little larger than bacteria. They feed on the tissue of the host organism and lay their eggs inside the bloodstream to reproduce. Protozoa are also Parasites, except they don’t lay eggs. Drinking dirty water is a common way to get a parasite infection. Common parasite infections include Giardia, tapeworm, hookworm and roundworm infections.

I have a huge lead in my research today. I already knew what the answer was to one part of my question from the start, but the other part I am still finalizing. My main question is: What are the threats to the human body and how does it protect itself? How does it protect itself is the immune system, that is obvious, but the other part I am still questioning. For my presentation, I am planning on making a brief explanation of organs and cells and whatnot, but I am not going to do this for the whole presentation. In the meat and through the end of the script, I am going to be diving incredibly deep into the immune system and explain how most funcions work and why. I think it is annoying that we have to be presenting for 1st graders becuase my topic is incredibly complicated and I don’t want to stop and have to define normal person terms in little kid language like “cells are the legos of your body”. I hate doing that becuase it interrupts the proffesionism of the presentation. Other peope are doing “dogs” and they can just roll their presentation beggining through end with no stops to define, meanwhile I have to explain phagocytosis to first graders. I wish they would sort the presentations from least complicated to most copllicated, so they can save the most complicated for adults, and save the least complicated for the kids. So talking researchwise, It is going well. I learned that not only phagocytes can kill pathogens, but normal cells can release enzymes called cytokins that can break down the pathogen, so they can eliminate them too. I am hoping to learn the second part of my question tommorow, so I can start writing my script.