AP BIOLOGY

Detailed explanation-1: -Animals that excrete waste nitrogen as urea are called ureotelic. The excess nitrogen after metabolism is converted into urea and then released in the form of urine from the body. Humans and cartilaginous fishes are ureotelic. Sharks belong to the class Chondrichthyes and are ureotelic animals.

Detailed explanation-2: -During excretion, certain animals excrete urea so they are known as ureotelic animals. Urea is less toxic than ammonia and requires less water to be excreted. Examples: cartilaginous fished, adult amphibians, mammals including humans are ureotelic.

Detailed explanation-3: -Ureotelic organisms include cartilaginous fish, a few bony fishes, adult amphibians, and also mammals including humans.

Detailed explanation-4: -They have no ordinary urinary tract, so they concentrate urea in their blood and excrete it through their skin. Thus, sharks, along with most other cartilaginous fish are ureotelic. Note: Species that excrete uric acid waste are referred to as uricotelic organisms.

Detailed explanation-5: -Ureotelic organisms include cartilaginous fish, few bony fishes, adult amphibians and mammals including humans.