Rat Rodent in crystal structure clip art

>Ram air turbineRadio access technologyRemote administration toolRemote access terminalRelease after transmision (Token ring)Rock Abrasion Tool of the MER-A (Spirit) and MER-B (Opportunity) Mars rovers. See more at Wikipedia.org...

all>Fossil Range: Paleocene - Recent See Classification Section The order Rodentia is the most numerous of all the branches on the mammal family tree. Currently there are, depending on the authority consulted, between 2000 and 3000 species of rodent—roughly half of all mammal species. Rodents are found in vast numbers on all continents except Antarctica (they are the only placental order other than bats (Chiroptera) to reach Australia without human introduction), most islands, and in all habitats bar the oceans. See more at Wikipedia.org...

>This article is about the form of solid matter. For other uses of this word, see Crystal (disambiguation). A crystal is a solid in which the constituent atoms, molecules, or ions are packed in a regularly ordered, repeating pattern extending in all three spatial dimensions.Generally, fluid substances form crystals when they undergo a process of solidification. Under ideal conditions, the result may be a single crystal, where all of the atoms in the solid fit into the same lattice or crystal structure but, generally, many crystals form simultaneously during solidification, leading to a polycrystalline solid. For example, most metals encountered in everyday life are polycrystals. Crystals are often symmetrically intergrown to form crystal twins. See more at Wikipedia.org...