Forum:What are the cards used in Fusion Summon that cannot be negated using Black Horn of Heaven?

I am confused much on Fusion summon and Special summon, since a fusion summon is also a special summon. Like when you activate the card "Polymerization", can you negate the special summon of the monster using Black Horn of Heaven? How about if you used the card Dark Calling, Future Fusio, Fusion Gate or Miracle Fusion, can you negate the Fusion Summon or Special summon of a monster using [[Black Horn of Heaven]? Please!,I would like to ask for your own understanding about it.