Answer:
c. X: commensalism
Y: Parasitism
Z: Mutualism
Step-by-step explanation:
X: commensalism
Rationale: in this type of relationship, only one organism benefits while the other does not benefit and is also not harmed in anyway. Whale doesn't benefits and it's not harmed by the Barnacles that benefits from the association.
Y: Parasitism
Rationale: in parasitism, one organism suffers while the other benefits in the relationship.
The fleas on warm-blooded animals is the organism that benefits solely from the association while the animals suffer.
Z: Mutualism
Rationale: in this relationship, both organisms benefit from the association and do not harm each other.
The Fungal and plant roots benefit each other.