Answer:
the kidneys
Explanation:
Mammals, many terrestrial amphibians and marine fishes mainly excrete urea and are called ureotelic animals. Ammonia produced by metabolism is converted into urea in the liver of these animals and released into the blood which is filtered and excreted out by the kidneys.
A robin flying south for the winter
The endometrium is the inner lining. The myometrium is the thick middle muscle. The serosa is the outer smooth layer.
