You are presented with the quiz "What  by spores develop into tiny, heart-shaped 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 "asexual reproduction is by spores produced in stalked sporangia ". 

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


 

   asexual reproduction        