Which statement correctly describes a difference between se xual and ase xual reproduction? A. Se xual reproduction only happens in animals, while as exual reproduction only happens in plants. B. Se xual reproduction requires fertilization of one gamete by another gamete, while as exual reproduction requires only one parent to produce an offspring. C. Se xual reproduction only happens in single-celled organisms, while ase xual reproduction only happens in multicellular organisms. D. Se xual reproduction only happens when cells have a nucleus, while as exual reproduction only happens when cells do not have a nuc leus.