Remoras, or sucker fish, attach themselves to sharks and travel with them. When the sharks feed, the remora detach themselves and feed on pieces of fish the sharks left behind. What two types of interactions are described in this scenario?

The shark preys on the fish it catches, so that interaction is predation. The remora benefits by getting transportation and leftover food, while the shark is not described as being helped or harmed; that relationship is commensalism. Therefore, the correct choice is “Predation and commensalism.”

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