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    Teratogens are _____ that can cause birth defects.

    1. Environmental agents
    2. DNA fragments
    3. Recessive genes
    4. Dominant genes

    #20322
    ProtonsTalk
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      Ans: A Environmental Agents
      Teratogens are environmental agents that can cause birth defects.
      Some examples of teratogens are alcohol and drugs. The affect of these agents varies depending on various of factors like amount of substance taken, duration of exposure and so on.
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