What characteristics do viruses share with living things? - Cellular respiration - Photosynthesis - Reproduction - None of the above?
Viruses do not have cellular respiration, because they are not cells, which is why antibiotics do not affect viruses.
Viruses do not photosynthesize, because they do not have chloroplasts or chlorophyll, whatsoever.
Viruses do "reproduce", but in a different way. They inject their genetic material into a cell, effectively hijacking its machinery to mass-produce copies of the original virus before lysing (basically dissolving the cell membrane) and releasing these viruses to spread and infect more cells, which produce more viruses which infect yet more cells.*
I believe the answer is Reproduction
*Credits here for part of the answer.