Two natural defences the body has against viruses?

1. Physical barriers: The body has several physical barriers that prevent viruses from entering the body. These include the skin, the mucous membranes of the nose and throat, and the stomach acid.

2. Immune system: The immune system is a complex network of cells, tissues, and organs that work together to protect the body from infection. The immune system can recognize and destroy viruses, as well as produce antibodies that can help to prevent future infections.