Specifically, it is the tissues in the bone which makes up the skeleton. This bone tissue is composed of cells with extracellular matrix that is calcified. Bone contains collagen and calcium phosphate which contribute to it mineral structure and firmness.
Newts are generally a safe pet, however there are a few species that are known to carry salmonella, and other species are in fact poisonous, but only if consumed. The brightly colored bellies of a newt are one way to tip a person off to their toxicity.ewts are generally a safe pet, however there are a few species that are known to carry salmonella, and other species are in fact poisonous, but only if consumed. The brightly colored bellies of a newt are one way to tip a person off to their toxicity.
Poison dart frogs. Poison dart frogs are so named because their poisonous secretions have been used by Amerindian tribes to poison blow darts for hunting. Only three species are dangerous to humans. One of those-the golden poison frog-is considered the most toxic vertebrate on Earth.oison dart frogs are so named because their poisonous secretions have been used by Amerindian tribes to poison blow darts for hunting. Only three species are dangerous to humans. One of those-the golden poison frog-is considered the most toxic vertebrate on Earth.