There are probably others, but the two most notable are gills and a tail.
Because they have two very different parts of their life.
tadpole to frogThis is called metamorphosis. You all just need to get a lyffe! joke! i love science!The term 'Maturation' should also apply.I think also that there is another term...When a tadpole turns into a frog, we call it metamorphosis, or the process of transformation from an immature amphibian form to an adult form in two or more distinct stages.
A tadpole has a two-chambered heart and a frog has a 3 chambered heart.
Frogs have four limbs, two hind legs and two forelegs.
NOTHING!
A tadpole's heart typically has two chambers, one atrium and one ventricle. This simple heart structure is sufficient for the tadpole's circulation while it is in the water and undergoing metamorphosis into a frog.
It depends on the species. The bigger the frog the longer it takes. A tiny tree frog could take a onth or two, and a huge bullfrog could take five months.
It typically takes about 6-9 weeks for a leopard frog tadpole to grow its hind legs. The front legs usually develop a week or two after the hind legs. At this stage, the tadpole is undergoing metamorphosis into a frog.
They lose their tail, gills, gill pouch, and part of their intestines.
Depends on the species of frog, the country and the size of the body of water. Generally in America, eggs laid in a smaller body of water (a road rut) the eggs will evolve from a creature that has gills and is entirely needful of water to live into one that has no gills and is in need of lesser degrees of water, in about two-three months (green frog, pickeral frog). In a larger body of water--pond--the same species may take another month or more. The above process also depends on the water not becoming too warm or drying up or being polluted. Some species (bullfrog, in a lake ) can remain a tadpole for two years or more. The tiger salamander's tadpole (axolotl) in a lake where it is impossible to leave the water (steep shoreline) may retain its gills and breed. Some (Sumatra Toad) may carry on its metamorphosis within the parent and be born as a "baby" frog.
Amphibian lay their eggs in water and hatch in water.
Caterpillar to a butterfly and tadpole to a frog.