Which one is smaller? Virus or bacteria?
Virus is smaller.
What do you need to see virus and bacteria?
We need an electron microscope.
What disease does polio virus cause?
It paralyzes people.
What disease does an influenza virus cause?
It causes flu.
What is the system that fights against virus and bacteria called?
It is called immune system.
Why can't virus infect top layer of our skin?
Because it is made of dead cells.
What will happen when viruses reach your stomach?
They are usually destroyed by stomach acids.
