The most common type of virus that causes foodborne illness is the norovirus. <span>Norovirus is not usually dangerous infection that can cause diarrhea, vomiting, and stomach pain. Infection by norovirus can be transmitted from person to person (directly) or via contaminated water and food (indirectly).</span>
Independent variable: is the UV light exposure
Control group: people not exposed (sample b)
Dependent variable: skin cancer
Experimental group: (sample A)
The ultimate source of energy is sunlight, and living things must break the sunlight down using their own methods to use it.
