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The common frog is a poikilotherm and is able to function over a wide range of body core temperatures. A poikilotherm (/ ˈ p ɔɪ k ə l ə ˌ θ ɜːr m, p ɔɪ ˈ k ɪ l ə ˌ θ ɜːr m /) is an animal (Greek poikilos – 'various', 'spotted', and therme – 'heat') whose internal temperature varies considerably.
It has short lateral ridges which never stretch all the way from the head to the end of the body, their form changes considerably as the frog grows. The young frogs are quite sturdy and look almost plump but the adults show dorsoventral flattening. As the frogs grow their eyes become more centrally placed, and the eyes of adults are very ...
Frogs are valued as food by humans and also have many cultural roles in literature, symbolism and religion. They are also seen as environmental bellwethers, with declines in frog populations often viewed as early warning signs of environmental damage. Frog populations have declined significantly since the 1950s.
The world's largest frog is the goliath frog of West Africa—it can grow to 15 inches (38 centimeters) and weigh up to 7 pounds (3.2 kilograms). One of the smallest is the Cuban tree toad, which ...
The unipapillary kidney with a single renal pyramid is the simplest type of kidney in mammals, from which the more structurally complex kidneys are believed to have evolved. [ 17 ] [ 6 ] [ 18 ] Differences in kidney structure are the result of adaptations during evolution to variations in body mass and habitats (in particular, aridity ) between ...
Scientists have grown kidneys containing mostly human cells inside pig embryos, an important step toward growing kidneys and potentially other human organs.
The development of the kidney proceeds through a series of successive phases, each marked by the development of a more advanced kidney: the archinephros, pronephros, mesonephros, and metanephros. [1] The pronephros is the most immature form of kidney, while the metanephros is most developed. The metanephros persists as the definitive adult kidney.
Cuban tree frogs will grow to the size of a human hand, eat other frogs and now are in Georgia. Gannett. Erica Van Buren, Augusta Chronicle. January 2, 2024 at 4:01 AM.