Question

why do viruses need living hosts, such as bacteria or eukaryote cells?
a the host cell is the source of food for the virus.
b viruses depend on the host cells that they infect to reproduce.
c viruses have a cellular structure which never require a host.
d viruses depend on a host cell because they lack their own dna or rna.

Explanation:

Viruses are acellular and lack machinery for reproduction. They use host cells' resources to replicate. Option A is wrong because viruses don't "eat" food. Option C is wrong as viruses have no cellular structure and need hosts. Option D is wrong because viruses have either DNA or RNA. Only B correctly states viruses depend on hosts to reproduce.

Answer:

B. Viruses depend on the host cells that they infect to reproduce.