Animals conduct certain behaviors is mating. some practice in which one male breeds with only one female and others practice ,in which one male breeds with multiple females.

monogamy; polyandry
polygyny; monogamy
monogamy; polygyny

igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

hope this