Question

which organism requires a host cell for reproduction? viruses bacteria plant cells animal cells

Explanation:

Viruses lack the cellular machinery to reproduce on their own. They must infect a host cell and hijack its resources (such as ribosomes, nucleotides, and energy - producing mechanisms) to replicate. Bacteria can reproduce asexually through binary fission without a host cell. Plant cells and animal cells are themselves host cells (for viruses) and can reproduce through processes like mitosis (in the case of somatic cells) or meiosis (for gamete formation) independently (without being dependent on another cell type for their own basic reproduction process, though they can be infected by viruses).

Answer:

viruses