You are presented with the quiz "Sporangia produce spores that develop into what gametophytes?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "sporangia produce spores that develop into tiny, heart-shaped gametophytes" and "gametophytes of extant genera are green, photosynthetic,and have a long ribbon shaped thallus". 

So, what's the best answer to the question?


 

  green photosynthetic         