In the 1950s and 1960s, birds exposed to excessive levels of the chemical ____________________ were often unable to reproduce successfully because their eggshells were so fragile.

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The Answer of In the 1950s and 1960s, birds exposed to excessive levels of the chemical ____________________ were often unable to reproduce successfully because their eggshells were so fragile.

In the 1950s and 1960s, Birds Exposed to Excessive Levels