They evolved to do so! The reason berries exist at all for the most part is
to entice birds or other animals to eat the seeds inside them and poop them
out somewhere else where they will sprout. The plants aren't producing the
berries just out of the goodness of their hearts. :-)

Utopia in Decay
http://home.comcast.net/~kevin.cherkauer/site/

Kevin Cherkauer


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...

I am surprised that seeds survive the digestive process!