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 ...
A substance made up of two or more elements bonded together is called a compound. If they were simply mixed together and not bonded it would be called a mixture. youre right b â¦ ut they would be called compounds not a compound.15 people found this useful.hen two or more atoms of the same element are bonded together they  become a molecule. If the atoms belong to different elements the  chemical bonding results in the creati â¦ on of a compound. 2 people found this useful. Answered. In Elements and Compounds.