read the passage. then answer the question. white sea urchins live in tropical oceans. sea urchins are…

read the passage. then answer the question. white sea urchins live in tropical oceans. sea urchins are covered with hard, sharp spines. these spear - like spines protect the sea urchin from predators, such as fish. sometimes a small worm, called a bristle worm, also uses the spines for protection. the worm lives on the sea urchin, between the spines. to attack a worm on the sea urchins body, a fish would have to get past the spines. when the worm lives on the sea urchin, the worm does not change the sea urchins ability to survive. which type of relationship is formed when a bristle worm lives on a white sea urchin? commensal mutualistic parasitic

read the passage. then answer the question. white sea urchins live in tropical oceans. sea urchins are covered with hard, sharp spines. these spear - like spines protect the sea urchin from predators, such as fish. sometimes a small worm, called a bristle worm, also uses the spines for protection. the worm lives on the sea urchin, between the spines. to attack a worm on the sea urchins body, a fish would have to get past the spines. when the worm lives on the sea urchin, the worm does not change the sea urchins ability to survive. which type of relationship is formed when a bristle worm lives on a white sea urchin? commensal mutualistic parasitic

Answer

Answer:

A. commensal

Brief Explanations:

The bristle - worm benefits (protection) while the sea urchin is neither helped nor harmed (its survival ability is not changed), which is commensalism.