Question

barnacles attach themselves to whales. as the barnacle is a filter feeder, it also gets access to more water (and more food) due to the relationship. whale is unaffected.
tapeworms reside in human intestine and take nutrients from the human
both species benefit
a grizzly bear snatches a salmon out of the river
predation
parasitism
commensalism
mutualism

Explanation:

• Barnacles attaching to whales where whales are unaffected and barnacles benefit is commensalism.
• Tapeworms in human intestines taking nutrients is parasitism as the tapeworm benefits and the human is harmed.
• Both - species benefit describes mutualism.
• A grizzly bear snatching a salmon is predation where the bear (predator) hunts the salmon (prey).

Answer:

• Barnacles - whales: commensalism
• Tapeworms - humans: parasitism
• Both species benefit: mutualism
• Grizzly bear - salmon: predation