Posted by Marrion on Monday, October 19, 2009 at 11:37pm.
For the first part of your question, can y ou associate urea with uretha, urine? That will give it away. (kidneys)
For the 2nd part, please look here:
http://www.google.com/search?hl=en&client=firefox-a&rls=org.mozilla:en-US:official&hs=DpQ&ei=0DLdSo2OFI2m8AbT4tVb&sa=X&oi=spell&resnum=0&ct=result&cd=1&ved=0CA0QBSgA&q=trophic+level+with+the+least+amount+of+energy&spell=1
Sra
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