Understanding Vivarium Substrates. By A. C. Highfield. Libyan tortoise-this tortoise requires a sandy, dry substrate. If maintained on grass or upon a moist substrate it will suffer shell and respiratory infections.Along with heating and lighting systems, the choice of substrate in tortoise vivaria and terraria often causes a great deal of confusion to keepers.Some substrates are excellent, others positively lethal.nderstanding Vivarium Substrates. By A. C. Highfield. Libyan tortoise-this tortoise requires a sandy, dry substrate. If maintained on grass or upon a moist substrate it will suffer shell and respiratory infections.
In their general structure, heterocyclic compounds resemble cyclic organic compounds that incorporate only carbon atoms in the ringsâfor example, cyclopropane (with a three-carbon-atom ring) or benzene (with a six-carbon-atom ring)âbut the presence of the heteroatoms gives heterocyclic compounds physical and chemical properties that are often quite ...
1 The Definition of Ionic Compounds The word ionic refers to any compound between one or more cations and one or more anions. 2  A cation is an ion that has fewer electrons than protons, which makes it positive. 3  Aâ¦. 4  The Periodic Table of Elements Life is sustained by a number of chemical elements.