Salazar made a chart to describe some relationships among species.
Relationships among Species
Boxing crabs gently carry anemones in their claws to sting predators Fleas live on the warm body of a dog, biting the dog
and keep them away. The anemones feed off bits of food the crab and eating its blood. The flea bites cause the dog to
drops.
itch.
Which headings best complete the chart?
O
X: Competition
Y: Parasitism
X: Competition
Y: Commensalism
X:Commensalism
Y: Mutualism

The question seems muddled up.

Here is a better arrangement of the Question:

Salazar made a chart to describe some relationships among species. Relationships among Species X Y Boxing crabs gently carry anemones in their claws to sting predators and keep them away. The anemones feed off bits of food the crab drops. Fleas live on the warm body of a dog, biting the dog and eating its blood. The flea bites cause the dog to itch. Which headings best complete the chart?

X: Competition Y: Parasitism

X: Competition Y: Commensalism

X:Commensalism Y: Mutualism

X: Mutualism Y: Parasitism

X: Mutualism Y: Parasitism

Explanation:

Looking at the relationship between the boxing crabs and the anemones, we can rightly infer that the relationship depicted is that of Mutualism. In mutualistic relationship, both organisms tend to benefit from the relationship of each other. As can be seen, the boxing crabs gains protection against predators, as the anemones they carry in their claws sting predators. The anemones also derive food from bits of food that the crabs drops while feeding. The heading that would be appropriate for this is Mutualism.

On the other hand, the relationship between the dog and fleas is that of parasitism. In parasitism, one party suffers while the other drives benefits from the relationship. In this case, the fleas live on the dog and causes harm to the dog by sucking its blood and also bites the dog, thereby causing itching for the dog. The appropriate heading for this would be Parasitism.

X: Mutualism Y: Parasitism

Explanation:

the awnser is d i think