These changing quantities are called variables. A variable is any factor, trait, or condition that can exist in differing amounts or types. An experiment usually has three kinds of variables: independent, dependent, and controlled.
The Inland taipan (Oxyuranus microlepidotus) is considered the most venomous snake in the world with a murine LD50 value of 0.025 mg/kg SC. Ernst and Zug et al. 1996 list a value of 0.01 mg/kg SC, which makes it the most venomous snake in the world in their study too. They have an average venom yield of 44 mg.
Two of the most poisonous snakes are also the most sacred -- the rattlesnake and the cobra. Of all the species of cobra, the King Cobra reigns as the largest venomous snake in the world. When the cobra is alert, it rises up and flattens its neck into the distinctive 'hood' that is instantly recognizable.