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
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