Biologists Believe That Whooping Cranes Suffer from a High Rate

question 81

Multiple Choice

Biologists believe that whooping cranes suffer from a high rate of developmental deformities of the spine and trachea because of ____.

• A) biological magnification of DDT
• B) exposure to hormone-mimicking pollutants from plastics
• C) a population bottleneck and loss of genetic variability
• D) conservation biologists saving chicks that would have died at hatching
• E) exposure to PCBs used as insulators in electronics

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