On Sun, 26 Jul 2009 19:50:33 EDT, [log in to unmask] wrote:
>I would like an explanation as to the mechanism by which creatures
>delivered without benefit of placenta or mammary can receive immunity from their
>parents.  

The short answer is that bees do have the equivalent of mammary glands with which they 
produce royal jelly which contains a variety of substances that affect the development of 
the larvae. But beyond this, any organisms that share food can easily also share beneficial 
bacteria, enzymes, gene regulating substances, etc.

plb

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