Gold(Au) - Gold is a highly sought-after rare metallic element. For many centuries gold has been used for money, jewellery and ornamentation symbolising wealth and prosperity. Like other precious metals, gold is measured by troy weight and by grams. When it is alloyed with other metals the term carat (or karat in the USA) is used to indicate the amount of gold present. Pure gold is twenty-four twenty-fourths (24/24ths) gold, and is called 24-carat gold.
Reptiles are a group (Reptilia) of tetrapod animals comprising today's turtles, crocodilians, snakes, lizards, tuatara, and their extinct relatives.
A vertebrate is an animal with a backbone. (An invertebrate is an animal without a backbone.) Fishes, amphibians, reptiles, birds, and mammals, including humans, are all vertebrates.Vertebrates share some basic characteristics.he Web's Best Sites. Encyclopaedia EncyclopÃ¦dia, Britannica. Inc a vertebrate is an animal with a. (Backbone an invertebrate is an animal without a.) Backbone, fishes, amphibians, reptiles, birds and, mammals including, humans are all. vertebrates