Respuesta :

guanshan

Answer:

they are very dangerous.

Explanation:

they cause disease in humans, animals, crops, and can cause permanent damage to immune systems.

coreyidkp

Answer:

viruses can shut your immune system and infect blood cells thus killing you. vaccines will provent this by prepering your immune system so when you get said virus, it will reduce your chance of death

Explanation:

im not smart with health but i hope this is correct!