Dangerous world inside you

Index -The immune system 2-5 -Auto immune disease 6-7 -Cancer 8-12 -The complement system 13-14 -Fever 15-18 -Vaccines 19-21 -Ecosystem in the body 22-24 -Story time 25-27...

Eren LinckenMy Name is Eren as of 2026 im in 6th grade and 11 years old, and i was born in 2015 and my favorite games are basketball, tennis, UNO and Ludo! and my PFP is from when i was in 2nd grade