It happened because there is the precise admixture of chemical elements delivered to our planet by mechanisms we don't understand.
Perovskites have been a focus of much research lately because, with the right admixture of chemical elements, they work as very efficient solar cells, converting light to electricity.
The only heavy element with high cosmic abundance is iron, and because an iron nickel alloy is an important meteorite component, it is reasonable to conclude that the Earth's core consists largely of metallic iron with a minor admixture of other elements.
In contrast, there was considerable interspecies admixture of mobile elements, in particular genes associated with the SaPIn1 pathogenicity island, metal detoxification, and the methicillin-resistance island SCC mec.
All of the hydrogen in the core has been burned out, and this central region is composed almost entirely of inert helium, with trace admixtures of heavier elements.
The council of some 120 pastors and evangelists who effected this union among diverse regional associations adopted a simple type of polity that was an admixture of Congregational and Presbyterian elements.
He himself admits that such a treatise is almost universally neglected by philosophers, and feels himself constrained to justify such a study, which he undertakes with an almost inevitable admixture of religious and theological elements.
The nonuniform admixture of fat and marrow elements also may result in an inhomogenous appearance on T2-weighted images [ 8- 11].
The observation of the right ovarian tumour displayed admixture of malignant, epithelial and mesenchymal elements.
The Arabian species assemblage represents an admixture of African, Western Eurasian, and South Asian elements, and this pattern is exemplified even in the relatively depauperate Arabian bufonids.
