The most common type of virus that causes foodborne illness is the a. tobacco mosaic virus b. cytomegalovirus c. norovirus d. poliovirus

The most common type of virus that causes foodborne illness is the norovirus.   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).

An egg, or a sack of flour

No because the eaeht is on a 23.5 degree axis tilt and so when it is winter the northern hemisphere is pointing away from the sun and the soutubern hemisphere is pointing toward the sun