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RELEASED

Which substance is considered to be a factor affecting Earth’s ozone layer?

A

chlorofluorocarbons

B

ethyl alcohol

C

nitrogen gas

D

water vapor

North Carolina Test of Biology. Form I RELEASED Fall 2009

The crab Lybia tessellata carries a pair of sea anemones on its claws. The crab uses the sea anemone’s stinging tentacles as protection and the sea anemone obtains small food particles released by the crab as it feeds. Which type of symbiotic relationship does this best illustrate?

A

commensalism

B

mutualism

C

parasitism

D

predation

NCDPI

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