Human structure.........................
All the metabolic wastes are excreted in a form of water solutes through the excretory organs (nephridia, Malpighian tubules, kidneys), with the exception of CO2, which is excreted together with the water vapor throughout the lungs. The elimination of these compounds enables the chemical homeostasis of the organism.
I have the same question as well but I don't know the answer. The only thing I know is that I believe C. Metamorphosis is not correct.
But I am not 100% sure.
P.S. I may not be correct but I think it could be A. lithification because 'lithos' means rock.
