AP BIOLOGY

Detailed explanation-1: -Excretory System in Amphibians Amphibians have two kidneys, just like humans, and those kidneys filter wastes out of the blood and combine them with water to form urine. Urine then travels from the kidneys via the ureters to the bladder, and then out through the cloaca.

Detailed explanation-2: -The excretion in frogs is majorly carried out through kidneys (filters blood), ureters (transportation of urine from kidneys to bladder), cloaca (structure where eggs/sperm, urine and faeces leaves the body) and urinary bladder (stores urine).

Detailed explanation-3: -The most advanced kidneys in which loop of Henle is present are called metanephric kidneys, these are in all; except one.

Detailed explanation-4: -Reptiles perform excretion through small kidneys. Their main excretory product is uric acid. The reptile kidneys are not able to produce liquid urine thus they excrete in more concentrated forms. This is due to the lack of loop of Henle in their kidneys.