Which one of the following statements about the trophic cascade in the sea otter and sea urchin-kelp communities along the West Coast of North America are true? Check all that apply.  

_____  Increased sea otter populations are linked to more profuse growth of the kelp forests.
_____  Increased orca (killer whale) predation on sea otters is linked to more profuse growth of the kelp forests.
_____  Increased sea otter populations are linked to increased sea urchin populations.
_____  Increased orca (killer whale) predation on sea otters is linked to increased sea urchin populations.
_____  Increased sea urchin populations are linked to less profuse growth of the kelp forests.


__X__  Increased sea otter populations are linked to more profuse growth of the kelp forests.
_____  Increased orca (killer whale) predation on sea otters is linked to more profuse growth of the kelp forests.
_____  Increased sea otter populations are linked to increased sea urchin populations.
__X__  Increased orca (killer whale) predation on sea otters is linked to increased sea urchin populations.
__X__  Increased sea urchin populations are linked to less profuse growth of the kelp forests.

Biology & Microbiology

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