The testes.
They have froggy kidneys
structural homology
err... maybe because the structure of the organs of a frog is most likely the structure & position of organs in a human's body... and frogs are easy to get or buy... and many species are not endangered! :) hopin' this can help!
Frogs live both underwater and above (on land). They are amphibians.
The oviduct.
Cloaca
Frogs can be found in all countries.
Urine is waste from the blood that the kidneys filter from the body. Kidneys in the body of a frog function in the excretion of urine.
Leopard Frogs (also known as common frogs or meadow frogs) can be found in damp environments, in temperate parts of North America.
the answer is the veins
The ear
hornworts are found on frogs