challenge: What was the main focus of Julie Denslow's 1980 study published in the journal Biotropica?
  
  A. The effects of deforestation on tropical rainforest biodiversity
  B. The impact of climate change on tropical rainforest ecosystems
  C. The role of pollinators in tropical rainforest seed dispersal
  D. The gaps created in tropical rainforests when trees fall and how trees adapt to these gaps
  Answer: 