I feel certain that in number 5 that "relationship" IS the object, and that the fact that it is "definite"and "between X and Y' are the modifiers. because as study concluded what? It concluded there his a relationship. What type of relationship did it conclude? It concluded a relationship that is definite, and that is between X and Y.

I feel a similar mistake was made on Q1 where "bacteria" is the object, and Q4 where "winds" is the object.

so, technically, with X modifying the modifying modifier, that's makes him a modifier too, right?