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.
Reptiles are cold-blooded. That is, they lack the ability to regulate their metabolic heat (heat derived from the oxidation, or burning, of food and from other processes) for the production of sustained body warmth and a constant body temperature.Cold-bloodedness, however, does not mean that a reptile is necessarily cold.he class Reptilia (living and extinct reptiles) is divided into 6 to 12 subclasses by different authorities. A number of these subclasses are completely extinct. The subclasses contain about 24 orders, but only 4 of these are still represented by living animals.