I am doing an assignment on teratogens and need help with the following questions:
1. How/ why are environmental substances being identified as teratogens?
2.how does a teratogen get close enough to an embryo to affect it?
3. Why are more children not born with congenital effects due to teratogens ?
4. Are teratogenic disorders permanent or temporaray and can they be inherited?
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I now only require answers to questions 3 and 4
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