A virus is a living organism that can only reproduce if it is inside another living thing. Viruses are contagious, and many viruses make you sick. Both plants and animals can catch viruses.
The virus in the picture is influenza, or the flu.
Earthworms live under the ground in your garden. They eat fallen leaves and make the soil better for plants to grow in. Worms are slimy, to help them travel through the soil.
