An armada of orca whales surface to breath as they swim close to shore in Washington state
An armada of orca whales surface to breath as they swim close to shore in Washington state Tacoma News Tribune/MCT
An armada of orca whales surface to breath as they swim close to shore in Washington state Tacoma News Tribune/MCT

National

June 07, 2012 12:00 AM

Biodiversity helps sustain human life, scientists say

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