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A hydrogen bond requires both a lone pair of electrons on a O, N or F atom and a hydrogen atom. In water there are two lone pairs and two hydrogen atoms, allowing the formation of two hydrogen bonds. In a...

An overuse of antibiotics means the non-resistant strains are killed, leaving less competition for the resistant-strains of bacteria, so they can mutate to reproduce more resistant strains of bacteria.

First we label the two equations as (1) and (2):2x - 3y = 16 (1)x + 2y = -6 (2)We want both equations to have the same number before one of the variables so the easiest way is to multiply equation (2) by ...

Kidney filters blood via ultrafiltration filters small particles of blood out such as sugar salts water and urea. Large particle such are red blood cells and white blood cells stay in blood. Filtrate move...

To some degree Tacitus seeks to establish an accurate presentation of the principate in Annals I, and this is evidenced through his engagement with contemporary sources and references to widely k...