Pollutants linked to fewer female births

A new study shows there's evidence that PBB's and PCB's may affect human reproduction.

The two industrial chemicals linger in the environment and can accumulate in the fat of fish, mammals, and birds.

Researchers say women inadvertently exposed to high levels of these chemicals had a higher than average rate of male births.

Some speculate that certain chemicals may affect the viability of sperm that bear the "y" chromosome, which determines male sex, or the viability of male fetuses.

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