Review Food Web-11

Cannonball Jelly fish are excellent swimmers, and Portly Spider Crabs often hitch a ride on them. What type of relationship is that?

  1. mutualism

    No. In mutualism, both organisms benefit. The jellyfish gets no benefit from the crab's hitchhiking.
  2. commensalism

    Yes. In commensalism, one organism (the crab) benefits, and the other (jellyfish) is not affected. The crab gets free transportation, and the jellyfish is not helped or harmed.
  3. parasitism

    No. For parasitism, one organism benefits, and the other is harmed. Neither the crab nor the jellyfish is harmed by this relationship.
  4. predation

    No. In predation, one organism eats another. Neither the crab nor the jellyfish gets eaten in this relationship.

Click to see which state standards this question tests, and which of my videos, experiments, and other resources support that topic.


SC.7.L.17.2 Compare and contrast the relationships among organisms such as mutualism, predation, parasitism, competition, and commensalism.
Secondary Consumers video, ClosedCaptions
Review Food Web-11 practice
Review Food Web-12 practice


UT.8.II.2.a Categorize the relationships between organisms (i.e., producer/consumer/decomposer, predator/prey, mutualism/parasitism) and provide examples of each.
Producers video
Primary Consumers video, ClosedCaptions
Secondary Consumers video, ClosedCaptions
What is a Food Web? text page
Review Food Web-2 practice
Review Food Web-1 practice
Review Food Web-3 practice
Review Food Web-4 practice
Review Food Web-5 practice
Review Food Web-6 practice
Review Food Web-7 practice
Review Food Web-8 practice
Review Food Web-9 practice
Review Food Web-10 practice
Review Food Web-11 practice
Review Food Web-12 practice


MS-LS2-2 Construct an explanation that predicts patterns of interactions among organisms across multiple ecosystems.