challenge: What is the difference in ploidy between Mesoamerican and South American specimens of Rhipsalis baccifera?
  
  A. Mesoamerican specimens are triploid and South American specimens are diploid
  B. Mesoamerican specimens are hexaploid and South American specimens are tetraploid
  C. Mesoamerican specimens are diploid and South American specimens are tetraploid
  D. Mesoamerican specimens are tetraploid and South American specimens are diploid
  Answer: 