- Joe Biden (allthetropes.org)
Joseph Robinette Biden Jr. (born November 20, 1942) is the 46th president of the United States of America. He is one of only eight people who served as Vice President before serving as President (in his case, he served under Barack Obama), and only the second person (after Richard Nixon) to have served as a Senator and as Vice President before becoming President. He’s also the oldest person to have been elected President of the United States of America.
- Amphibian (Wikipedia)
Amphibians are ectothermic, anamniotic, four-limbed vertebrate animals that constitute the class Amphibia. In its broadest sense, it is a paraphyletic group encompassing all tetrapods excluding the amniotes (tetrapods with an amniotic membrane, such as modern reptiles, birds and mammals). All extant (living) amphibians belong to the monophyletic subclass Lissamphibia, with three living orders: Anura (frogs and toads), Urodela (salamanders), and Gymnophiona (caecilians). Evolved to be mostly semiaquatic, amphibians have adapted to inhabit a wide variety of habitats, with most species living in freshwater, wetland or terrestrial ecosystems (such as riparian woodland, fossorial and even arboreal habitats). Their life cycle typically starts out as aquatic larvae with gills known as tadpoles, but some species have developed behavioural adaptations to bypass this.