HEARING & EQUILIBRIUM

Have you ever had the misfortune of experiencing what it's like when you sense of balance is disturbed by sneezing too hard? Watch the video and learn why this happen.

INFECTION AND RESPONSE

Pathogens are disease-causing viruses, bacteria, fungi or protists, which can infect animals and plants. 
Humans have an immune system, which can defend them from pathogens.

Wach the following videos
https://www.youtube.com/watch?v=zQGOcOUBi6s
https://www.youtube.com/watch?v=wUm71FPuVCQ


Now try the following test. Good luck!
https://www.bbc.co.uk/bitesize/guides/zcqs2nb/test