You are presented with the question "Protonemas develop into what?" and the following answer choices: 
- alveoli
 - ferns
 - lmestone
 - disease
 - illness
 - parasites
 - gas
 - spores

Now knowing that flowers produce spores that develop into gametophytes and gametophytes arise from a protonema, choose the best answer.


 

        spores 