posted by Marrion .
1. Urea is made where? Is it in the kidneys or the liver?
2. Which trophic level gets the least amount of energy?
I think the answer is c, but i'm not sure if it's right.
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: