Nicotiana sylvestris flowers only during long days and N.tobacum flower only during short days in the labortory undre different photoperiods , they can be induced to flower at the same time and can be cross fertized to flower aat the and can be corss fertillzed to produce self - fertile offsping .What is the best reason for considering N. sylvestris and N . tobacum to be separate species

Options

A. They cannot interbreed in nature
B. They are reproductively distinct
C. They are physiologically distant
D. they are morphologically distinct.

Answer

A