Salazar made a chart to describe some relationships among species. Relationships among SpeciesXYBoxing 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?
Answer
A
X: CompetitionY: Parasitism
B
X: CompetitionY: Commensalism
C
X:CommensalismY: Mutualism
D
X: MutualismY: Parasitism
Explanation
The crab and anemone both benefit: the anemone protects the crab from predators, and it gets food from the crab’s leftovers. That relationship is mutualism, so X is mutualism. The flea benefits by feeding on the dog’s blood, while the dog is harmed by the bites and itching; that relationship is parasitism, so Y is parasitism.
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