Fact 1: Flowers produce spores that develop into gametophytes.

Fact 2: Gametophytes arise from a protonema.

Given the two facts above, answer the question "Protonemas develop into what?" with the following options: 
- alveoli
 - ferns
 - lmestone
 - disease
 - illness
 - parasites
 - gas
 - spores


 

        spores 