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there are over 400 speciies of crayfish in North America.  One specie, the Virile crayfish, has slowly expanded fromt he east coast to the waters of Montana.  There it encounters the Calico...

A crayfish lives in a shallow pond along with frogs, turtles, various insects and small fish.  Meadowsweet grows on the banks of the pond, which is rimmed with grasses and reed?  The...

Imagine if there was a campaign to wipe out all baceria.  Why would this not be a good idea?  Include the terms amino acids, ammonia, nitrites and nitrates when referring to the role of...

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